I kind of do. I have 2 burners (the crappy one with the 15-minute safety timer that came with my Turkey Fryer kit but gets the job done, and a Bayou Classic), 2 mash tuns (48-quart Coleman cooler for 5-gallon batches and a 70-quart Coleman Extreme for 10-gallon batches), and 2 chillers (my old copper-coil IC and my nicer DudaDiesel plate chiller), but only one boil kettle. Technically, I could boil one batch in my 7-gallon aluminum turkey fryer pot, but it doesn't have a valve, so I'd have to siphon out the cooled wort.
Honestly, the notion of brewing 2 batches simultaneously has crossed my mind, but the thought of how busy I'd be, and my fear that I'd miss something or be busy with one batch during a crucial moment with the other, has kept me from trying. The best I've done so far is 2 batches on the same equipment, and overlapping them to save time. That is, I'd be mashing batch #2 while boiling/chilling batch #1. Though I always brew alone, so if I had a second set of hands to help out, I might be tempted to get both rigs going and do 2 batches simultaneously.