A lot of the time when I'm fishing small creeks, it comes down to a roll, flip, dap or bow-and-arrow -- depending on what obstructions there are. A roll requires a clear opening in front and can deliver the fly more accurately once you've got the technique down. Just a little flip may be all you can squeeze in if there's a lot of brush around. If you're in skinny water, you've got to think about the movement of your rod, line and leader through there. Dapping the fly -- just dangling over the water -- can be effective when your options are severely limited. I've rarely used the bow-and-arrow. It takes more room to load the rod than you'd think, and I've never really been able to get a lot of velocity on the fly or deliver it with any accuracy. It's really a last-ditch move for me.
Roll casting is a technique you should master, including a cross-body roll cast. I still practice it when the fishing is slow. Flips are less scientific -- just getting the fly out there -- but it's worth working on.