I don't think there are too many, no. But I've found that most of the swamps that i come across go on for several hundreds of blocks. Close to 7-800. That's too big in my opinion. So my problem isn't frequency, but size.
Swamp biomes occur at about the same frequency as all the other 6 common biomes. (forest, swamp, taiga, extreme hills, plains and desert)
So no there are not too many.
It may seem that way if you don't like them, however, especially because the world generator will avoid spawning you most of the time in 3 of the above biomes (desert, extreme hills and plains) and most commonly spawns you in forest, taiga or swamp. (I'm guessing because of the abundance of trees which are a critical starting resource.)
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When no one was looking, the Endermen took forty blocks.
They took 40 blocks. That’s as many as four tens. And that’s horrible.