Oh, yes. Every once in a while I start a new project involving colourwork, and think: Yes! That's exactly what this needs! Then I get to the point where I need to actually start doing Fair Isle knitting, and... gah. Do you have any idea how tough it is to keep an even tension while knitting socks with two colours? The yarn is either too tight or too loose, and all colour changes mean stitches that are (you guessed it) too tight or too loose. Then I have to go back and start evening them out later, one by one.
I really don't know why I bother, unless it's in the faint hope that some day, it's all going to magically click and I'll get perfect tension. Eh, I still have one more sock and 17 rows of colourwork to go, and Christmas is creeping closer. At least 75% of this knitting is plain!