Our experience this past holiday weekend: if you have a good plan, crowds can be a non-issue.
On Saturday we were at DL at rope drop, a less than five minute wait at Matterhorn bobsleds, got a FP for HSM and Buzz light year, breakfast, walked right on HM, Thunder mountain, and POC, then HSM and Buzz. Then walked to Trader Sams for lunch and libations (after a little shopping in DD). We spent the rest of the day enjoying the DLH and DCA, looking for
Disneyland cats, riding rides at DCA (Ariel's, Luigi's, Goofy, Monster's inc, Mater) and then had dinner at DCA. Really, no crowds or long waits encountered.
On Sunday, my wife realized that if the early magic hour is at the other park, crowds are even less of an issue. We started at DL (EMH at DCA), and again, no significant waits (there were crowds at Tomorrow Land, but we only had that experience when we went over there to walk on to Buzz). After rope drop, we walked on to Mr. Toad's, Alice, (breakfast), Buzz, HM, POC, JC, Thunder mountain, and then a brief wait at Autotopia. We hopped on the Monorail and went back to Trader Sams (we get there about 11:20, they open at 11:30 and again, no lines/significant wait). Back to DCA (we are avoiding the crowds at DL at this point) where we did another Mater's, repeatedly tried to get Francisco to pay us some attention-more Disneyland cat stalking), another Luigi's, and then headed up to the Cover Bar where we had drinks, dinner, and then watched World of Color from the bar.
In summary, we were expecting major crowds, but either didn't encounter them/they were a no-show, or, we avoided them effectively with our plan.
Feedback/etc... por favor