That kind of upgrade is just fine. Not asked for and not expected. Maybe the room with the parking lot view had a pipe break or some other reason to take it out of service, and they had no others to place you in. Good for you!
My issue is with people that come onto boards like here (well, DIS is worse by far), and ask how they can get upgraded for free, even though they don't deserve it. What do I have to say, how should I act, what do I put on my reservation, etc. They say, well X got an upgrade, and so should I. Well no, you shouldn't. There are usually very specific reasons for the change, and most have to do with the room you booked having to be taken out of service for some reason, and they had nowhere else to put you. The entitlement mentality displayed by all too many folks is just sickening nowadays, and I wish they would all stay away from WDW. Sorry, rant over.