Well, for us I guess it would be more like we've gone through strollers like...chia seeds. Or coconut oil.
Anyways, just doing a quick count here and the tally is eight. Three of those have been double strollers. Brands have included Safety 1st, an older Peg Perego, Valco Baby and some randoms. Styles have included chariot, jogging, umbrella, Sit 'n' Stand, and...regular?
Walking is very important to me, as it's the only way I fit intentional exercise into my busy days. Having a stroller that is easy to push, fits everyone/everything, and stores compactly is necessary for me. If I am wrestling that thing around corners and running over strangers' toes at the post office, I'm not going to feel motivated to get out for some exercise and fresh air with the littles.
Along the way I've gained some valuable insight on what to look for (and what to avoid) when choosing a stroller.