Nor do I, never found it essential to really learn it. So long as what you write sounds good, who cares what key you play, or scale, or mode? Some people may tell you different, others will agree its nonessential. It does tend to make music a little more... sophisticated though. I mean, before I started learning scales and chord building everything I wrote sounded pretty similar. Now it just has more flavor. Its just a personal preference of whether you want to take the time to learn it, or just go play until you have something cool.
You're an inspiration for birth control. - Duke Nukem.