I chose bike only. Every once in awhile, I take transit but only when I'm with those creepy non-cyclist types. It's so stressful takeing the bus.
One hassle I encounter when I bike everywhere is people insisting on giving me a ride in their car. My parents used to be really bad for it but they're catching on to the fact that I'd much rather bike across the city than sit couped up in a car. It's such an alien concept to motorists and it's not always easy to explain.