That refurb list looks scary, BUT I think it looks worse than it really is. Let's break it down:
Matterhorn Bobsleds (Disneyland) closed through 3/11/10, 4/12/10-4/16/10 and 4/19/10-4/23/10 for refurbishment.
If this is correct, we get to ride 4/17 and 4/18. Glass half full, folks.
Award Weiners (DCA) closed through 4/18/10 for refurbishment.
Golden Vine Trattoria (DCA) closed through 4/26/10 for refurbishment.
Corn Dog Wagon (Disneyland) closed through 5/4/10 for refurbishment.
Tomorrowland Terrace (Disneyland) closed through 7/2/10 for refurbishment. Jedi Training Academy will continue to be offered while the restaurant is closed.
These are all food locations, and forgettable ones at that. Tomorrowland Terrace is Cosmic Ray's minus Sonny Eclipse. I won't miss it. There's much better food to be had on property, and there are other places to get over-priced burgers and hot dogs.
Rivers of America (Disneyland) closed through 5/6/10 for a major refurbishment. All attractions requiring the use of the river will also be closed.
Davy Crockett's Explorer Canoes (Disneyland) closed through 5/6/10 for refurbishment.
Tom Sawyer Island (Disneyland) closed through 5/6/10 for refurbishment.
Sailing Ship Columbia (Disneyland) closed through 5/6/10 for refurbishment.
Mark Twain Riverboat (Disneyland) closed through 5/14/10 for refurbishment.
Fantasmic! (Disneyland) closed through 5/27/10 due to major refurbishment of Rivers of America.
Yes, the river will be drained, and the area won't look as nice, but frankly I never rode the canoes, getting over to the island and back is usually more hassle than it's worth (though I did like the Pirates re-theme), and the Columbia and Mark Twain usually don't run at the name time anyway. The big loss here is Fantasmic. DL's Fantasmic kicks WDW's butt, in my opinion. It's the one thing on this list I will miss.
"Honey I Shrunk the Audience" (Disneyland) closed through 1/28/11 due to the temporary return of "Captain EO."
This is a GOOD thing. Rarely does Disney ever bring back an "extinct" attraction like this, so I'm personally very excited about getting a rare opportunity to see EO again!
Tower of Terror Fastpass (DCA) will not be offered 4/10/10-8/15/10 due to construction of the connector between Bug's Land and Tower of Terror. A more permanent route is being built between the two lands.
Only the fastpass is closed, not the ride itself.
Princess Dot Puddle Park (DCA) closed 4/12/10-4/16/10 and 4/19/10-4/23/10 for refurbishment.
Redwood Creek Challenge Trail (DCA) closed 4/12/10-5/20/10 for refurbishment.
These are two kidde play areas in DCA. I actually like the Challenge Trail, but Unless you're under the age of 12, I don't think you'll be missing them much.
Disneyland Monorail (Disneyland) closed 4/19/10-4/20/10 for refurbishment.
Disney Showcase (Disneyland) closed 4/20/10-4/21/10 for refurbishment.
Disney Showcase Annex (Disneyland) closed 4/26/10-4/27/10 for refurbishment.
News Stand (Disneyland) closed 4/26/10-5/20/10 for refurbishment.
Big Thunder Mountain Railroad (Disneyland) closed 4/26/10-5/16/10 for refurbishment.
Corn Dog Castle (DCA) closed through 3/24/11 due to construction in the area. Corn dogs are currently available at the Bountiful Valley Farmer's Market.
None of these apply to us, since all these go down for refurb either BEFORE or AFTER the ABD trip.
Orange Stinger (DCA) closed through 4/28/10 for refurbishment. It will re-open as Silly Symphonies Swings.
This is an off-the-shelf chain swing ride that you could ride at your local county fair. There's nothing really Disney about it, and I'm glad they're doing the re-theme. The giant orange peel around it always looked like some cast-off from Heimlich's Chew Chew Train to me.
So, to sum up, the only real negatives are no Fantasmic and limited ride time on the Matterhorn. Pretty much everything else will be operating normally. Yes, the main waterways in DL and DCA will be drained, and there will be some construction walls. So, that means a few less (or different) pictures. Otherwise, it shouldn't be disasterous.