So I just stumbled on this thread. There seem to be a lot of opinions presented to this young (I assume) student and not a ton of data.
I'm an ID/CCM physician, academic faculty, hold various positions of some note in CHEST and SCCM, serve on a couple of IDSA committees. My practice structure is relatively analogous to what a pulmonary intensivist does - about 0.5 FTE in critical care (meaning a week per month, on average, in the ICU) and 0.5 FTE in ID, where I do mostly transplant ID. I have joint appointments in ID and CCM at my institution and practice both specialties.
A few passing thoughts on the earlier parts of this thread:
1. Yeah, not a lot of ID doctors do many procedures. People who still do some inpatient IM might do the occasional bedside procedure, but I can barely find any full-time hospitalists who still do many bedside procedures. Folks who do a lot of HIV and STI work are more likely to do LPs, but the earlier descriptions of ID as a cognitive and not very procedural specialty are absolutely right. The hands-on nature of bedside evaluation by ID is very tactile, to be fair, but it's not the same thing exactly.
2. I always find it amusing when other people tell students about what my job is like. There was a nice survey published in Clinical Infectious Diseases by Sameer Kadri to which the great majority of ID/CCM physicians responded (there are maybe 250 or so of us in the US). The short version is about half of us practice just CCM and about 40% of us practice both. (The rest are a mixture of "pure" ID physicians and those with non-clinical jobs, like in government or industry.) I am lucky to practice ID and CCM both, and I wouldn't have it any other way. Was it a little more work to find a job doing both ID and CCM than compared to, say, being a pulmonologist or whatever? Sure, it took a little more work. Big deal.
You do have to set some priorities. I recently stopped doing much outpatient HIV, for example, in part because I changed jobs, but also because it had become clear to me over the years that having an easily-distracted intensivist was maybe not the best plan for my HIV-positive patients who really just needed a good internist. I can still manage HIV and STIs, but I am no longer that good at managing outpatient diabetes, for example, and if you work in a practice model where the HIV specialist is also your primary care doctor, I might not be the guy for that. But consultative ID in combination with the ICU is not that hard and can be a nice cognitive break. Most of my partners in my critical care section do something else besides the ICU: OR anesthesia, emergency medicine, pulmonary or other IM subspecialties, whatever. It is a good thing and, I think, makes you a better intensivist, both intellectually and emotionally.
Also: ID involvement in infection control is based on the job and your personal interest. Whoever said we always get involved in "bunch of administrative infection control BS" is a little off base. Lots of ID doctors get involved in infection control, but some of us enjoy it. (I did my time as IC chair once, it was fine, but I don't do it anymore. I am involved in our stewardship program, but I find that a lot more interesting and is genuinely very important to me, since too many of our non-ID colleagues still have no idea how to use antibiotics well.)
3. For the original poster: others have commented that it's pretty early in your life cycle to start making firm specialty plans. This is true and wise. (I was planning on doing general surgery when I was a first-year student.) But you may notice that there are a lot of people telling you what you can and can't do or what you should or shouldn't do. You should ignore most of these people. One of the great things about medicine is how you can shape your own career and your own practice to fit your interests and aptitudes. There are a lot of overly-linear thinkers who will try and explain how deviation from the One Set Path is doomed to failure. I'm not saying you shouldn't consider the specific ramifications of a decision you're making and be prepared to deal with the consequences. When I was on my most recent job hunt, I found it pretty easy to get an all-ID job and pretty easy to get an all-CCM job. So I had to look a little harder. Like I said, big deal. A good thing is worth the effort.
Happy to discuss more if you're interested.