I have "themed" scrapbooks, and then some non-themed ones.
I have a Vacations book that has about 5 years worth of vacations in it because we didn't take that many pictures (before I scrapbooked). I have one that has a trip to Durango in it, but it is really thin, so I will probably wait until we go out west again to do another one like that.
I have started doing a yearly album which has stuff only from last year in it. I think I will do this every year, although I may combine some that we don't have a lot of pictures for.
Then for big vacations we have one or two albums. We have a smaller one for a cruise we went on a few years ago, and we have a large one and a small one for our Disney trip last year.
This summer may be a Summer Vacation album. I haven't decided. This would be in addition to the yearly album.
So, whatever way you want to do it works well.