I have a station with variable temperature...I think I set it once about 10 years ago and haven't touched it since. The big keys seem to be matching the tip/wattage/solder for the job at hand. For circuit boards, that means a fairly small / tapered tip, small gauge solder and you can probably get away with 25-40 watts easily. My station used to have a sponge, when that deteriorated beyond use, I switched to a couple of heavy paper towels folded up and dampened.
I guess the bottom line is, the fancy stuff is nice, but good boards can be assembled with a simple iron, the appropriate tip and solder, and a small paper towel to keep the tip clean.