Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
When I mention to colleagues in the IT industry that compiling packages before installing them on a computer is a good thing, they either give me a blank look or an ever slight smirk. What is the point wasting many hours waiting for some package to compile instead of fetching the binaries from a repository and have it installed in seconds?
Come to think of it, I am actually writing this while waiting for Gentoo to upgrade GCC from 3.4.4 to 4.3.1. It may not sound much but it's actually a big deal. GCC is probably the package that takes the longest slowest to build, in order order of two hours, even on recent dual-core 64bit machines.
Clearly, building from sources is much slower than fetching the binary package. But, building from sources will implicitly check that the required dependencies for the package under construction are available.