I suppose if you asked 10 different people this question, you'll get 10 different answers.
For us, It all depends on what we have planned. Frankly, We'd rather stay at a Value, and spend the extra money splurging on dinners at all the real good restaurants (WELL, AT DISNEY, ALL OF EM ARE REAL GOOD, BUT YOU KNOW WHAT i MEAN)
Also if we are going to the parks all day, my wife and I both feel it is silly to spend all the extra money on a deluxe room we're only going to be passing out in.
Now our needs may change later in life, the thought of having a monorail to get right back to the room is very appealing for when we have children.
If we just wanted to go for a weekend to relax, and get away without doing a park, then spending more for the deluxe ammenaties, pools, spa, etc.. is a good idea.
Like I said, 10 different people, 10 different answers