Yeah I won't use the fill tool...though I try to fill in a lot of my breaks in my ink lines, there's always something I missed.
Like @Lensing suggests, I fluctuate between using the regular lasso & polygon lasso with the paint bucket- especially when doing flats or laying down large areas of color. Once I lay down the flats I then will use a combo of the lassos and the magic wand to build on the foundation, adding and stripping away stuff until I get the look that I need.