I think I understand what you mean...lol. DHS will be very crowded, but you have 3 other parks to go to??? Did I get it right???
Not exactly. Here's what I mean:
Park Vs. Park
Disneyland has 33 rides. DHS has 4. The sheer number of people that Disneyland can swallow in terms of rides alone is insane, especially when you consider that several of them are WDI's poster-children for good capacity. This is important, because we're not talking about walking paths at this point. We're talking about going to a theme park where EVERY single ride will have waits of at LEAST an hour for most of the day, (probably closer to two in the case of Tower of Terror, Rock'N'Rollercoaster, and Toy Story Mania, and don't even get started on the three new ones). Disneyland is going to have long lines, but there will still be things to do that can be walked right onto throughout the day. That luxury will not exist in DHS (it barely does now).
Disneyland also has a Star Tours that is not easily accessed if one is trying to get to Galaxy's Edge in a timely manner. Before you say that Star Tours will not be a strong draw, remember that Disney is adding a scene from Episode IX to the ride right around the opening of the land. While the most direct path between them (the hub) is going to be a nightmare, that was going to be the case anyway, and it will be a BLESSING to not have to worry about every single Star Wars fan descending upon the same area at the exact same time every day. DHS' version is a few hundred yards away, at most, and is already on the most convenient way to the land. If anything, Muppets will start filling to capacity due to sheer proximity (this is not a bad thing, however). The entire southern half of the park is going to be CRAZY, especially considering that there's going to be a lot of guests who are going to show up for Toy Story Land.
The pathways are going to be awful in both, but Disneyland has a lot more to pull people off the streets. I think it'll fare better after the grand opening (which I will be attending and will probably regret but I will not miss it for anything) than DHS will.
On the other hand, there's the resort as a whole. WDW has been heavily investing in infrastructure for the past two years. Roads expanded, new parking (DHS is getting doubled), revamped entryways, and this is considering that traffic at the resort is already pretty good. They know what's coming, and they're preparing properly. Then, there's Disneyland, which is located in a part of the country renowned for how bad traffic is, and whose latest parking garage is in development hell and in no way will be ready for Star Wars. You're also looking at a resort that will be recieving a high volume of tourists in addition to the HUGE annual passholder base. Disneyland's going to be less crowded simply because nobody will be able to get off the highway, much less find a parking space.
So in short, I think:
Disneyland Park will ride out the storm better, but WDW Resort is better prepared for the crushing masses.