It's ridiculous how much of a time-sink VCV Rack can be: I have so many saved patches that are simply studies of modular concepts or simply explorations of different module types. It gets really rad when you start to hybridize between that and hardware as well (I'm only just beginning with eurorack, myself, but one of my first priorities was to acquire an appropriate interface to get everything talking... too early for the ES-9, though), but even just as something to include in a signal chain for effects, dynamics, or different mixing strategies, it's just fantastic. I feel a little guilty sometimes using Bitwig, now that it has its own approach to modular, but I figure that VCV's always there to fill in the gaps; VCV's still the best way to figure out eurorack hardware though--in terms of what modules to get and their general usage, particularly since it's sometimes used to showcase modules which are available as hardware.
I'm thinking I might have to buckle down and do a whole album with mostly VCV shit, but for now, I've just been using it for one-offs and studies. I think, though, I might want a 16n Faderbank or some Midilar modules before undertaking something like that.