Well, they're not that loud. The building H/V airflow is usually a lot louder. And my Retina MacBook doesn't even have a fan. (Though I also don't do a lot of software development on it, I have done development on slower machines, and it wasn't terribly painful. Depending on what I was doing, of course.)
I still remember the days of programming in C++ using C-front, and a compile would take 20 minutes. Being a gdb wizard was essential. These days, even with Scala, compilation is fast enough on a four-core iMac that debugging via print statements is easier than using a debugger.
I guess I'm old enough that I just haven't gotten spoiled by expecting everything to be superfast. Though what does annoy me is how slow many websites are. Grrrrrr! When programming in fancy IDEs is faster than surfing the web, you know that something is wrong with the world....