When I first started getting into building guitars, I was quite confident that if I used hand planes I would wreck the job and avoided them like the plague. I had a Stanley #4, a small wooden smoothing plane and a massive wooden jointer plane that I inherited from my grandad who built boats - I had no idea how to really use them or set them up, and spent a while thinking of ways to avoid using planes such as buying a power jointer or building a router thicknessing jig. Now that I've been at it a while, I've since found a Stanley #3 in my other grandad's cellar (along with a quality oilstone), and bought a great Stanley #7 on ebay, and also figured out how to set up planes and sharpen the blades properly with oilstones and waterstones.
After making nice long, thin shavings as opposed to leaving dusty scratch marks on the surface of boards, I've had a plane epiphany of sorts, and really enjoy using them now. I love how easier the mess they leave is to clean up, and how much safer they are compared to using powered tools. What do you guys tend to prefer? Relying on power tools for ease of use and setup, or are you more eager to get out a hand plane to get a job done?