I rarely drove during grad school. I lived in Oakland and it was so easy to walk, catch buses, or bum a ride from a friend who had to pass through the neighborhood anyway. Even though I had my car and enjoy driving, I just never needed it. My car was actually towed by the city at one point and I didn't even notice for a couple weeks. It had been in the same spot for ages before that.
I started driving a lot more after graduation because I moved to East Liberty and wasn't really connected to the bus routes I needed. Most of my classmates had left and my remaining friends didn't have cars, so I went from the guy who always mooched rides to the one who gave them almost overnight.
Once, though, when I had only been in town for a few months, I had to drop a friend off at the bus station downtown. On my way to get back to Oakland via Bigelow, I came to an intersection that looked pretty straightforward, so I proceeded straight. Only when I get through do I realize that traffic going in my direction was supposed to bear right around this little median, so I ended up briefly in the complete wrong lane.
Fortunately it was past midnight and no one was coming in the other direction. (Probably in part because it was an absolutely frigid December night.) Despite my trouble, I somehow ended up missing Bigelow entirely and wound up taking the Boulevard of the Allies back to Oakland, which seemed to happen every time I drove downtown, regardless of how I intended to get out.
Coming back to Pennsylvania for a couple weeks and doing a lot of driving made me miss the layout of Tucson, especially after going into Philadelphia a couple times. There's something to be said for being able to have significant stretches of most main roads be three lanes wide. Also I will take overly-cautious-yet-oblivious snowbirds and retirees over insane southeastern Pennsylvanian, Delawarean, and New Jerseyan drivers anyday.