Does anyone know if life at the Academy is the same for people who are entering as enlisted, as opposed to those out of highschool or whatnot? Are the restrictions the same? Or since we have already been "restricted" through BMT and Tech school.. is it more laxed?

Its pretty much the same.

By regulations, it is the exact same.

However, you have a leg up on those out of high school, since you already have an idea of how things work.

As a basic cadet, you will be expected to help your peers more than others. You will be expected to be a step ahead of most. (Same thing through the first year.)
You will have the advantage of being respected slightly more. The upperclassmen are gnerally less inclined to rag on first year cadets who have been in the military before.

Now, if you act like a jerk...people will come down even harder...

After the first year, things are pretty much the same between prior-E cadets and those straight from high school/college.