Why not pursue a tech position where you scribe, work up patients, actually participate in procedures, and get paid a livable wage with better hours? Sounds like the better option to me. Furthermore I never said or implied it was stupid and overrated. I simply said I don't personally understand the pull to the position because it had more cons than pros for me. No one is denying that it is great exposure.
I will answer your post point by point.
Techs in the ED do not scribe. They might (I don't even think they do, never witnessed this) write a short note about them performing the EKG and having the MD sign off on it. But I don't even think they do that. It's possible they do something when they have to splint, but I haven't seen a tech sit at a computer for more than 1-2 minutes while typing, ever.
Floor techs might have to write more down, but then I bet it's more progress (eg "pt sleeping, helped to bathroom 20 minutes ago, vitals stable) than anything. Which is fine and very valuable for the healthcare process. As far as understanding the ins and outs of a physician's work life, it's next to nothing in value. For the person, it's good exposure to health care and life experience.
I don't know what your definition of "work up" is, but techs do not do anything that is remotely related to what a workup is in the ED. Taking vitals, transporting, EKG, and CPR (some techs are trusted to do it), among others, are all very valuable tasks that make an ED work. They are not, however, a workup. A workup is composed of the MDM that comes after the H&P of a patient and involves imaging, labs, consults, and treatment.
Yes, they observe procedures. As far as participate (unless you include splinting and EKG), they are really limited. I do just as much in the room as a tech does for something like a central line. That's one example, but it will vary from procedure to procedure.
As for getting paid a livable wage, I think that's all great and stuff, but as a prospective medical student, GPA is the most important thing. It's going to be really tough balancing working as a full-time ED tech (which would be a livable wage) and full time school. Is it worth it to do full-time ED tech work? Absolutely. And some individuals will need something like this to be self-sustaining. But, you also have school. If you can be a full time tech and do school, go for it. But, if you have the luxury of only needing a part time job, scribing is a great option and you should weigh which will be more valuable to you as a prospective medical school.
I will reiterate that my scribing position is not in a huge company and we are valued more as individuals. We have the ability to do rounds, listen to lectures on current events in medicine, and have flexible schedules. It's a program designed to get students into medical school. We had over half of our applying medical students get into MD.
Remember, the goal of pre-medical activities is to prepare one for medical school and becoming a physician. Some people may benefit more from being a tech than others. Some simply don't have the typing ability to be a scribe. That's fine, everyone takes their own path. Some days I wish I was a tech, and some days I couldn't be happier that I'm a scribe. That's only within the ED though. There's so many other jobs out there that can prepare you for being a great physician.