Everything is not open. But when are you going????
In DL - Splash Mt. is closed right now, til the end of May. Star Tours 2 will be reopening in June, so currently it's closed. The Matterhorn will also be closed for pockets of days this summer. Again, exact dates are important!
In DCA- Goofy's Sky School (previously Mulholland Madness) is still closed, but will be reopen, and of course in a month Ariel's ride will be opening.
And for the rest of this week, the Rivers of America/Tom Sawyer's Island is closed for the take down of the Pirates Premiere. And Fantasmic is not starting again til the 14th.
View the
DIsneyland Calendar
http://disneyland.disney.go.com/calendar/daily/#/default/2011/05/10
click on the link that says "view refurbishments" you should do it day by day.