I am also a capital ship flyer. Fast ships are all well and good, but you don't get that visceral rush of watching your heavy batteries thunder to life and your opponents' armor glow incandescent as your weapons fire vaporizes it. Also, AI capital ships often maneuver poorly, and by that I don't mean that they fly around aimlessly, I mean they fail to optimize their positioning at high value targets.
But I also agree that it is a matter of taste. As many here have aptly pointed out, if you play a more dynamic ship as your flagship, it's often easy to lose track of the big picture. Capital ships are powerful enough that you can be secure in them while eyeing what's going on in the battle at large, but it is also true that they tend not to be as exciting to fly overall.