I am a lot like you.  I have never been the type A personality.  I went to college right out of high school finished a degree then didn't use it.  I joined the fire service instead.  I started toying around with idea of med school and started working on my pre-reqs while working.  Never took my pre-reqs more serious than my job (i.e. I kept working my standard 24/48 while taking all my pre-med classes).  I took the MCAT, did mediocre, applied and told myself I'll give it one shot, if I don't get in, eh.  Well I did.  I've done ok, not anywhere near top 10%, but I'm fairly certain I'm somewhere in the top half.  And that's good enough for me.
Though to answer your question I still work.  Not 24/48's anymore, but all through first year it wasn't uncommon for me to do a 12 during the week and a 36 on the weekend.  This year I've been keeping it mainly to 24's on the weekend since Step 1 is fast approaching.  It's a great way for me to blow off steam (nothing like busting through the door on a fully involved structure to relieve some stress 

), and hanging out at the "house" with the guys just generally keeps me sane.