Not necessarily. Lots of people who consider DLR their home resort don't live within driving distance. (I'm in Chicago, for example, and many other DLR vets are widely scattered west of the Rockies, not just in SoCal.) It's just part of your trip planning--the overlay downtime is reported along with the refurb schedules. So if you're used to checking refurb schedules for WDW, it really would be the same thing. Sometimes you end up having to visit when your favorite ride is being refurbed (i.e. BTMMRR and Splash at Magic Kingdom recently, etc.) Sometimes you get to choose your dates to make sure you what you want to ride will be open. It's kind of like that. What it usually wouldn't be, though (DLR's recent DOSHA ride-closure fiasco notwithstanding) is HM or iasw going down for the refurb overlay with no notice to help you plan around things, if that makes sense.
I hear that, but you might be amazed, too. Have you ever gotten to experience the NBC HM overlay at Disneyland? I actually prefer it over the regular HM. The graveyard scene is absolutely breathtaking!