My 87 is lowered about an inch all the way around. Since it's not my DD it's not that big a deal. Like Tom, I approach anything I feel I'll scrape on slowly and at an angle.
My 2000 Z28 will be lowered soon. That gets driven much more frequently.
I'll be "baggin'" it to get the desired effect. I'll be able to adjust the ride height at will for the conditions and slam it for shows.
The other day, at the Deputies funeral in Polk, we were parked in a field. To get in and out, we were driving through ditches, over humps and all kinds of chit!
With the proper entry and departure angles, most the time you'll be ok