Dallas_Lady:
looks like we'll be at the world during the same time as you are ( June 8th-24th for us)......maybe we'll run into you guys!! anyway, not to sound like a broken record, but, our strategy is similiar to the above posters:
get there early!!! that is the #1 tip I can offer...
if you're early risers, take advantage of EMH! you can get an awful lot done in the parks in that extra hour without the crowds...this is when we knock out the e-ticket rides; before the lines start getting heavy...if you have kids: If you don't use EMH for anything else, use it for the MK and knock out fantasyland without the sea of crowds....you'll never want to venture in there during regular hours again, trust me...
take advantage of the fastpass system!!! It's free and available for everyone to use....why wait in lines if you don't have to?
have a general idea of what you want to do in the parks before you go...Im not a great professor or user of the park touring plans like some of the folks here on the DIS, but, I recommend having a general plan of attack before you enter the park...get a park map and show schedule upon entering the park and while you're in the first line of the day; take some time and block off time periods for your plan of attack....this will cut way down of the frustration of just missing a show time and whatnot
we have also always employed a strategy of attending the EMH park and then after hitting the major attractions, getting out of that park and heading somewhere else as the crowds start to get heavier in the EMH park.....
along these lines; our general plan is to try and go against the masses...park hopping is one way of doing this....we also tend to eat meals at "off" times, reducing the amount of time "wasted" during the day waiting for tables and such....riding rides during the parades and other special events is another way to get alot done in less time....
If you're planning on spending more than 10 days in the WDW parks over any one year period of time; I strongly suggest that you consider buying AP's or PAP's if you like the water parks...this strategy not only saves money, but, more importantly to our family, provides the freedom to do "whatever" you want to do in the WDW complex....that freedom to just "go" or "do" whatever you want is worth its' wait in gold!!!
I guess my last tip is: just relax and don't stress out about whether or not you can "see" or "do" everything in any one trip...we've been many, many times, and still have not seen or done everything! It will be crowded during June this year(we've been during this time several times before). It will be hot and humid, and you can probably expect some rain alot of the days(usually quick afternoon showers)....take advantage of EMH and fastpass' and have a general idea of what you want to accomplish before you enter the parks and you will find it to be quite manageable and enloyable...