Everyone has a finite amount of time, energy, and overall human bandwidth to commit to their lives, and those without a lot to spare are not likely to keep looking once they've found something really good that they're satisfied with.

I'm always on the lookout for a new job, no matter what, and you should be too. I make it a point to try and schedule an interview with a new employer every 90 days. This strategy has served me extremely well. My resume stays updated, my interview skills stay sharp, I stay abreast of what's available the employment market, and occasionally I get a significant improvement at a new employer.

It's very rare for employers to give raises or promote from within. I've always had to move to get anything above a cost of living raise.

Yes, we all have a finite amount of time, and I would argue that looking for a new job is an extremely good use of that time.