You absolutely cannot compare the two, they are both different in their own rights, some aspects of DLP I hate and others I love. As with WDW you get a different experience each time you go and you must just take it that way.
I hate the fact that only Mickey & Minnie you can queue for an autograph for and the other characters you have to rugby tackle so we don't even try to get them, we usually do the character meals to get the other autographs.
I hate the fact that the other europeans are rude, impolite, aggressive and downright unpleasant when trying to get photo's/autographs.
I agree it can be expensive, however, we have been for the past 2 years in March for 5 nights/6 days, self drive on Eurotunnel (we drive down the day before and stay with relatives near Dover), in the Hotel Cheyenne including breakfast and park admission for the whole duration and it only cost us £560.
The first year we took only £500 spending money and ate counter service meals and our hotel food and the second year we took £1000 and spent it on the posher meals, both times we came back with loads of souvenirs, pins, dressing gowns, snowglobes etc and had a great time.
We've been to WDW once and two days before christmas I contracted Meningitus so it really put me off going back again but 3 years later and we're booked to go back next September and I can't wait BUT WDW is a whole different ballgame to DLP and should be treated as that.
In Florida you also have Universal, Seaworld, shopping malls, discount stores, Gatorland etc etc, oh and the weather of course but both times we went to Paris we had absolutely fantastic weather, t-shirts and short sleeves (in March I might add) but we love it because you can walk around the whole park in one day, go on the same ride 5 times a day, actually stop and look around, take in all the details, spend ages walking round Disney Village and not rush anywhere to get on anything.
You can also combine it with a day trip into Paris.
We are looking to go to WDW every other year and would like to go to DLP in the in-between years.
In a nutshell, if you can feasibly go you should because you should try it at least once but treat it for what it is, Paris and not Florida.
