Many techs will agree with me in preferring higher-intensity periods to lower-intensity ones – as long as the workload doesn’t exceed capacity. There is a simple reason for this; when there is a lot going on, you simply can’t afford to procrastinate, and so you’re forced to do your work as efficiently as possible.
On the other hand, low-intensity periods, such as when everyone takes their summer or christmas vacation, while pleasant, can mean that you get much less done than you would in higher-intensity periods, because you can procrastinate.
Even in slow periods, though, you can get a lot of things done. This requires that you exert discipline, and set goals. In my experience, slow days are great to do those tedious tasks that you don’t have to do, but which makes things easier all over, such as documenting a solution, or troubleshooting that problem that’s been on your back burner for the last three months.
By working pro-actively, you can also stop potential problems before they become problems. The risk, is of course that you suddenly get a lot to do, but at least then you don’t sit around twiddling your thumbs eh?