Given that your family loved the MSEP, I would also go with seeing PtN. It's basically very similar in concept (although with very different floats) and you can can even catch the MSEP music in the PtN soundtrack.
Otherwise...
I saw WoC: Celebrate for the first time last week. I have mixed feelings about the show; although, in full honesty, I'm not a huge fan of WoC to begin with because it's basically mist screen projections (so they're kind of fuzzy) with colored lights. WoC: Celebrate is the only one of the new 60th Anniversary shows that really felt like it had anything to do with
Disneyland. The show features a mixture of Disney movie clips and Disneyland attractions. So in that way, I think WoC: Celebrate is the only show that actually honors Disneyland itself. I did feel that parts of the show were kind of slow, so the tempo was a bit uneven. I'm generally ambivalent about Neil Patrick Harris, but I felt that he was a bit of a distraction in the show. His voice is okay, but the show would have been better if they'd found someone with a better singing voice. You really need to be able to see the Mickey on Ferris Wheel to see the whole show. WoC: Celebrate still uses the FP system (distributed near Grizzly River Run) and you need to get there as soon as they open the viewing areas if you want a front row spot (highly recommended). It's worth noting that during the holiday season, they'll be presenting both WoC: Celebrate and WoC: Winter Dreams. Depending on when you went last year, you may have seen Winter Dreams already.
Paint the Night is a very lively and colorful parade that features a lot of Pixar movies (Monsters Inc, Cars, Nemo, and Toy Story) and some of the classic Disney movies (Peter Pan, Little Mermaid, Princesses (Belle, Cinderella, and Rapunzel), and Frozen). Nothing about it really has anything to do with Disneyland, so in that way it doesn't really tie into the 60th anniversary. I wish it had a few more floats dedicated to the classic Disney movies. In that way, PtN felt a lot like a nighttime version of Pixar Play Parade (that parade also has Monsters Inc, Cars, Nemo, and Toy Story floats). The music is very catchy and you can hear strains for MSEP in it (which is nice). The biggest drawback is that you have to devote a lot of time to getting a good viewing spot. Lately, the front row/curb spots have been filling up 1 to 2 hours before the parade steps off, so if you really want to see it, you'll have to commit a fair amount of time to holding your spot.