Woah, yeah... I pretty much wear sandals whenever the weather allows it. The rest of the time I wear the new boots I just got, which are a sorta cross between sneakers and hiking shoes, fine for both. Before that I always wore sneakers, unless I was actually out hiking over rough terrain.
My feet get claustrophobic and I really REALLY hate it when they get sweaty, even just the tiniest bit... I get athlete's foot easily, see...