I avoid them in my mains, and use them heavily in my center and subwoofer.
Part of it is my signal chain. I spent $2k for my DAC, $1K for my preamp, plus amps. I really don't want to put in more signal processing in between the two if avoidable. I really like the use of digital only EQ's though, if I really was interested I would go that route.
In my subwoofer however, it is indispensable. It is impossible to get very good integration, and smooth, tight sounding bass with a single sub otherwise in the average room. +- 20dB dips are no joke. The equivalent of 200x the power output in narrow bass bands really makes it impossible to turn the subwoofer up. Not to mention getting the phase/slope right.
Best,
E