I have somewhere around a dozen meters, not counting meters in cameras. When I started with a spot meter I used it in conjunction with my other meters. In the beginning it seemed complicated and arbitrary, and at best I felt like I was guessing an average, and waffled on continuing to use it when it seemed to be a lot of fiddling, pointing and averaging to arrive at a reading when I could just push a button on an incedent meter and arrive at an exposure.
Luckily, before I could cop to the urge to abandon it, the light came on. My spot meter is now the only meter I use. The ability to exactly interperate where thing fall within an exposure is a level of control I would never give up. Everything else seems sloppy to me now. In my opinion, my ability to make negatives went to the next level when I truly wrapped my head around how to use the spot meter.
It may not be for everyone, but I personally find it one of the sharpest tools available.