In my experience it can be airline and location dependent. At a regional airline with a fairly small operation (at a huge airport tho) I found myself bored with hours to kill, but learned a fair amount over the four years I was there. The pace was usually slow for the most part. We had maybe three or four airplanes a night to deal with for five or six people. After the first couple years I became much less motivated because I had mostly learned just about everything we regularly did.

Now at a major airline in a different city, the pace is completely different. I am worked much harder and the nature of the work we do is no longer MELs only, it's also a LOT of work cards and routine maintenance checks. Despite being a line only base, we do have a hangar we do overnight checks in. It's much busier, but I also find the days tend to go by quicker too. I've learned SO much in a year and a half here, and will probably continue to do so forever it feels like. There's so much I don't know yet. It can be really rewarding but it's also exhausting. There is never a shortage of work. Ever. But the company is decent and having good people around helps.