Two of the people I have been hiking with recently talked about how they each get summit fever, and it scares me. I told both of them, "Don't attempt Everest yet, please." I really don't get summit fever much any more. I did, when I was somewhat new and felt I needed to get the summit to build up my climbing resume. But after enough bad weather days and a couple close calls high in the mountains, and reading enough accident reports, I don't really care about making the summit like I used to.
I like mountaineering, climbing, hiking, skiing, and being out in the mountains on difficult terrain in general. The summit is just a pile of rocks and snow, and they all basically look the same. The main difference is the size of the Longs Peak or Devil's Tower summit plateau vs a much smaller one like Crestone Needle or Mt. Everest, the same way some parking lots are larger than other parking lots.
It's interesting, the number of times in the last few years when I've been within about 500 vertical feet of the summit and been ambivalent about making it to the top. I would not have guessed this is a mental state of a climber. I used to think everyone wanted to get to the summit on every attempt. But now I realize that the process, the climbing itself is most of the fun. I've been on the top of well over 100 mountains above treeline, and while I will keep going after summits, I have no problem turning around near the top if conditions aren't right.