My wife and have become very fond of the Anaheim Hotel and have stayed there over our last several trips to DL. Ultimately, I think any price difference being worth it totally depends on what kind of emphasis you put on various parts of your vacation. Things I can say I like about the Anaheim:
A. As you noted it is quite close to the parks. You're roughly one block to the entrance on Harbor to the parks. Other folks I know don't mind the extra few blocks walk, but that can add up over the course of a day / at night when your feet are hurtin.
B. We personally love the fact that Anaheim Hotel has a lobby bar, where a lot of the hotels this close to the park entrance do not. Have had good bartenders and service, unless there is a convention going on (they do have convention space).
C. We have enjoyed the food at the connected restaurant (Pizza Press). Have had both breakfast and dinner - nothing to write home about, but solid and a convenience perk. We also have enjoyed coffee and breakfast at the Brewberry Cafe, which is only about a 3-4 minute walk down from the hotel.
D. The hotel is clean, has friendly staff, and as you noted, has a cool 60's vibe with a massive swimming pool - no theming, but again, massive.
All in all, I will note that it's not going to typically be as "nice" or modern as the Hyatt or other similarly situated hotels, but when we go to DL, we're not in the room often and the conveniences noted above really swing it for us. Hope that helps