I have a few while brewing.
Doesn't feel right without 'em. I'll actually put off brewing until I can drink a few. I'm mildly OCD, fairly anal retentive, and a general worry-wort.
so having a couple while brewing helps me not spend the day obsessing about every little detail.
Brewing Since July 2012 All-grain BIAB
Primary 1: Raging Irish Red
Primary 2: Lilsparky's Nut Brown Ale
Secondary 1: Skeeter Pee
Secondary 2: Air
Kegged: Two Hearted Clone, Graff, BM Centennial Blonde (again :) )