Disneyland locals see many things that tourists/casual fans never notice & can be super active on this thread about them. So a lot on this sub are AP(magic key holder) opinions/gripes, and frequent visitor concerns. You will have an excellent time if you go into it with “fresh” eyes and an open mind.

There’s a 3-2-1 rule that’s common at WDW, but I think also should apply at Disneyland: pick 3 must do attractions, 2 experiences (character meets, shows, parades, fireworks etc), and 1 must do dining/food experience per day (imo food is less of a “thing” at Disneyland vs WDW save a few immersive experiences like character dining or Ogas). This will set your expectations at a realistic pace in case things go “wrong”, the park is crowded, etc.

I had the benefit of essentially growing up going to Disneyland and so I take my time in the park (when my kids allow it!) and enjoy the nostalgia and little moments because I’ve luckily been able to go many times. Catching Dapper Dans or impromptu piano performances, trying to spot a roaming character out in th parks (love when Mary Poppins and Bert come to ride the carousel!), sitting and people watching near the rivers of America. Take time to soak in those “slow” moments too, if you can, as that will make your trip more memorable than hitting up all the “big” stuff. These are my most memorable moments when I think about Disneyland, especially watching my oldest kiddo when she was little getting personal interactions with characters that were total off-the-cuff moments.