I've heard you, and others, make this argument before, but I've never seen anybody actually back it up with facts or references to anything except more random posts/blogs. (Not that I any reason to doubt you. I'm just interested to see the reasons.)
Don't get me wrong it's not that Apache's bad, it's just bloatware in my opinion. Bloatware not in the conventional sense that there's too much for a single offering (although that probably could be true), but bloatware in the fact that it is so resource hungry for the simplest of tasks.
A prime example would be how fast it crumbles under serving a very heavy dynamic workload, hence the requirements for caching proxies on HA offerings.