I don't hang any lights outside but I do put two lighted trees on the front porch, one on the side porch and one on the screened porch out back. I used to hang ornaments on them but now just leave it as lights since no one gets close enough to see if they are decorated.
Inside, I take it pretty easy. I have full sized (between 6.5 to 12 foot) trees each with their own unique theme. If you include the porch trees and the two in the front garage windows, I only put up 32 trees.
Every year, I think that my family isn't into it and will not care and every years I start hearing "when are you putting up the trees?" earlier and earlier.
And before anyone judges me, keep in mind that the White House averages about 40 trees a year so I don't think I have a problem.