Sounds right...the thing that a lot of people starting in modular forget are those, and they're pretty essential. Using them on audio is the obvious thing, but the fact is that when you start using VCAs to control things such as modulation levels, or use them as modulation tools to impose a second modulation onto a first, that's when the voodoo that modular has starts to get really apparent. Plus, they have audio uses that aren't so obvious, such as crossmodulating one audio signal with another via AM using a VCA, resulting in some rich ring-modulation-type timbres. They just look boring, that's all.