Parking next to planters isn't foolproof. My wife drives an '08 Yaris (I know,
) and she always parks against planters. This means there is an extra half a parking spot for some douche bag to put their car in.
Seriously, she's got dings and stuff from people who have parked so close, we had to open the door on the passenger side and climb in over the bushes.
I usually make it a point to park near other F-bodies and Corvettes. If I even think there is a slight chance that my (long-ass) door will touch another car, I'll put my fingers on the edge of my door. I'd much rather mash my own fingers than someone else's ride. Of course, I'm not naive enough to think that other people would show the same respect.