SOT for me (WS Tarpon 160 old style).
I use the yak for transportation and as a fishing platform. I don't troll very much since I usually have a destination in mind when I get started. If I was fishing a brand new area I probably would since its a good way to cover alot of water and narrow down the search.
If I'm fishing from a drifting yak, I use a drift-sock (sea anchor or drogue). This makes a huge difference, especially for flyfishing. I use the same rig I use to adjust my anchor line. The sock slows down the drfit allowing a good presentation with flies and also helps stabilize the direction of the drift.
When sight fishing, look over your shoulder from time to time, you never know who's behind you