Fly tying offers the opportunity to use your experience and knowledge from time on the water to craft a tool that affects your fishing success. Rod building offers a chance for arts and crafts - my mom (the quilter) might like it. The rod, assuming it's fundamentally sound, has virtually no impact on the fishing. If a wrap ain't quite perfect, even spring-creek trout don't care. The colors you choose are for aesthetics only. It's a little cheaper, but it's not enjoyable like fly tying.
Since I've broken the Scott 3-wt I built at that class twice, I've been able to keep after this horrid hobby. Today, being 14F at 1:45pm, I finished the mid-tip section. It has character, and it will fish fine. It's certainly an original rod. I hope it stays in four pieces for the duration.
Next winter activity that sucks: Learning to tie the Humpy.