Usually, when I draw, I don't like doing linework. Lineart is basically tracing over a sketch with black (usually, I do my sketches in light blue so they're easy to trace over). Tracing is a fundamental part of art, animation specifically (animating is THE biggest pain) but that doesn't mean it's not bothersome. When I remove the sketch layer and look at the lineart, I cringe. The sketch looked better then the lineart! It's really ridiculous.
I attempted to animate in Photoshop CC once. I don't know why everyone likes it. It's tedious, there's no color wheel, only color sliders, and the brushes are....Blech. My lineart usually comes out looking even worse than before with CC. I can't say anything about Flash, since I haven't gotten it yet, but I will someday.
Lineart is a huge pain. It's not as big of a pain as coloring, but still a pain nonetheless. I wish I had SAI, but I'm content with Manga Studio. SAI's lineart has a special charm to it, a charm that makes it look better. I've used SAI only once, and it didn't have pen pressure, but hey, it's better than nothing. Drawing is a hobby of mine, and it's going to be a career, but boy is it tedious. Sketching, on the other hand, is enjoyable. The other components are aggravating, though.