I think it's kind of a typical journey, at least for people that can afford it.
1) Get dSLR, kit lens.
2) Frustrated with onboard flash, lousy indoor pictures.
3) Get a fast prime. Amazed.
4) The lost years - all shallow DOF all the time. Talk about 'bokeh' a lot.
5) Sell all zooms. Talk about being an 'all primes' shooter like this is the same as 'have huge manhood'.
6) Grandma says "Nice picture, shame all of Suzie isn't in focus." Shake head at crazy old lady. Later realize old lady has a good point.
7) Realize that not all available light is pretty light. Get Speedlight. Amazed by bouncing light.
8) Read strobist blog. Sell all fast primes. Travel everywhere with two lightstands and remotes.
9) Get sick of lugging lighting gear everywhere. Rethink everything.
10) Realize that good available light is fine, and the ability to make good light is important too. Acquire balanced kit of zooms and primes that match interests. Shoot with available light sometimes, shoot with flash sometimes.
I think I'm getting to 10 finally. Have gone through each and every stage except maybe the 8th stage lol. Never got TOO crazy with external lighting, but I do have a radio trigger, light stand, softbox, and umbrella (looking at getting a portral strobe soon). At one point, I went backwards and relapsed into the "lost years" with my primes, back have since come back to the light lol.
I'm starting to learn the importance of balancing the interplay of natural/ambient light, and artificial light (camera exposes the environment, flash exposes your subject), and how to manipulate the exposure triangle + artificial light to 'paint' a portrait. In this context, primes, although limited by their focal length, offer much more flexibility than zooms in terms of manipulating how light hits your sensor, and controlling DOF.
I use my zooms when I absolutely need the flexibility, but still see more value in primes (with my speedlight) when shooting portraits in controlled settings.