Thinking about it...zerk is actually the most fun/active perk to use!
The game does not get so boring when kiting as when camping....standing still for long periods of time is boring in real life too!!!
Being active is more fun! Standing still and shooting is not as fun as kiting and you need be more aware and thus you interact more with game then camping!
I fail to see how Berserker kiting can be more fun than camping. Consider:
1) Kiting takes a lot longer than camping. During each wave camping teams are constantly under attack; kiting teams spend at least half their time running away. Then is technically active, but I'd rather be standing still and shooting things than simply running.
2) Berserker kiting involves only two classes, mass zerk and a medic or two. This reduces variety and the fun that comes from it.
3) Teamwork is all but irrelevant when kiting. All it takes is one good Berserker to finish off a 6 man HoE wave. Thus the only truly needed teamwork is kiting in the same direction so you don't trap everyone between two groups of enemies. Drastically reducing teamwork in a cooperative game pretty much guts the main source of fun.
I'll be the first to admit some camp spots are incredibly dull. But if you're willing to forgo the boring little rooms with only one entrance I promise you far more fun can be had camping. If it's still too boring for you that likely means you need to increase the difficulty for increased challenge and fun.