I've used a March 809 pump for several years - mostly to avoid lifting. Over last winter, I moved indoors and went to an all-electric single-level HERMS. Now I have two pumps (Chugger) and can do recirculating stepped mashes. I also move all of my cold-side beer between fermenters and kegs by pushing with C02.
Why? Mostly because my back just doesn't hold up to lifting like it used to. I still wanted to be able to do step mashes without decoction, and find that I have more consistency across the board with the PID-controlled electric HERMS. Moving inside means I can be much more comfortable brewing when it's 95 or 5 degrees outside (we have seasons in Cleveland, OH), and my whole brewing operation is on one level of the house so I don't have to schlep things up/down stairs on brew day anymore.
That said, none of this is necessary to make good beer. Before all this, I made some beers that won medals in competitions using no pump and batch sparging "Denny Conn style" in a cooler with a CPVC manifold. We'll see what happens with my beers from the new system at our club's competition next weekend.