I will be completing residency in <3 months and joining my institution as faculty.
The reality is that I see very little changing. Yes, I will be making more money - a lot more, really - but that's about it. In academia, there is still the slight pressure to be academically productive (write papers, present at conferences, etc.) if you want to advance and be promoted, so that isn't going away. There is still oversight, feedback, etc. etc. like you receive as a medical student and resident, but the focus is different.
I'm most looking forward to having a job that I expect I will really enjoy and is the type of work that I really want to do. I like nearly all of the work in my specialty and have, on the whole, enjoyed much of my time in residency, but it'll be nice to stop the crazy life that is constantly rotating and moving from service to service.
My wife and I are splurging a bit and taking a ~2-week trip to Japan right after I finish. We plopped down some significant cash to fly business class and are staying at some nice hotels. It's nice being able to do that and not have to worry all that much about the financial ramifications.
I imagine things would be much more different if I chose a different path (e.g., community private practice), but given that I'm going to be at the same institution largely doing similar work to what I'm doing now, I don't expect my life to change all that dramatically. Even the hours I'm working now will be somewhat similar as I'm going to be working more to make more money and pay off my educational debt. But on the plus side, I'll at least be getting paid more to do it.