I spent a month in one. I spent one night of that time but when I woke up at dawn, note DAWN, some idiot was walking up for a visit and did I say I had just woke up? This lookout was not on a tower so I couldn't just keep the hatch shut. The gate was shut at the bottom of the hill though, but he still came on up. After that rude awakening, I commuted. It was too smoky to see much but I did do the radio relay bit and took the weather. I was entertained by hang gliding people taking off and noticed a ritual amongst them. They emptied themselves in the outhouse, then walked to the north edge and looked over, shook their heads and then took off on the gentler side of the mountain. Earlier, when I was not the lookout, a hang glider had tripped going off the cliff face and it took quite a bit of work to get him off the cliffside. It also shook up the regular lookout guy.
It isn't that lonely if you are on a lookout that can be driven to. In fact, I found myself wishing it wasn't such a popular spot. Or at least on a tower with a trap door to shut.