It's funny, when I started brewing, all I made was IPA's. Now typically during the summer I have one IPA on tap and something else to go with it. The only time I have two IPA's on tap is the annual Plinian Legacy/Off the Topper side by side. Otherwise, I typically have a milder ale on tap beside an IPA. From August on, I tend to lean darker (although I love Black IPA so I typically do that once or twice a winter) and more malt forward. Smashing Pumpkin (once per year), Denny's BVIP, Scotch Ale, Nugget Nectar clone (once per year), and a variety of stouts and reds, and occasionally a nice high gravity winter sipper. I really like all sorts of beers so it's nice to have variety. Clearly, I need to upgrade to more taps like @dannyboy58
Dogfishhead 90 Minute IPA is really the beer I credit with truly getting me into craft beer so I am fairly biased towards hoppy deliciousness. I used to hate beer in college because all I ever drank was college swill. Once I found out beers could actually have flavor, my eyes were opened to a whole new world. That coupled with Untappd have introduced me to a great variety of flavors and styles that I enjoy. I think a lot of new breweries around me opened up and pumped out a bunch of IPA's to generate interest but then expanded into other styles once they've gotten people in the door. It depends on where you go, but most places have a minimum of 2-4 IPA's on tap.