I've never understood this concept (not saying your opinion is wrong) but EPCOT is the only park that feels like a 2 day park to me, I can never fit in everything I want to do in one day.
Well, between you, me and the fencepost, I can only do so many laps around WS. The only thing that makes it into a 6-7 hour park for us is the gaps in the FP times (that you sign up for 3 months in advance). The food is great, but I can only stand 'so much' walking thru junk shops and waiting for my turn to get an 'EXTRA LARGE PEARL' and bang the drum...
American Experience is always good for a patriotic, self reflective, air conditioned break, and the liberty singers are just amazing. I can't go on SSE anymore because, well, I feel like I'm walking thru somebodies yard sale and listening to a dumbed down version of my old encyclopedia brittainica set, only to be put through a 5 minute descent thru darkness and dangling CAT5 cable, only being entertained by creating a specialized character and sending it to myself through electronic mail (I hear this is the wave of the future!). Soarin 2.0 has a case of sequelitus (bigger and more CGI = better!), so I don't find it worth the 19 hour wait times. I can usually walk on mission space because everyone is afraid of that ride and/or think it's well overdue for a refresh (luckily we're getting it now), so that's only about 15 minutes of my day. Test Track is okay, but after riding RS Racers, it pales in comparison and just doesn't 'do it' for me. By the time Frozen's (superior to the horrendous maelstrom, and I could care less if it's a dreaded IP (gasp!) ) fastpass time approaches, we've already ate twice and logged 12 miles of tromping around. By nightfall, when the torches are lit for the upcoming ROE, all I can think about what time we need to leave so we can get to the 2 hour wait for the monorail. And I know i'll get poo-poo'd (I always do) for saying this, but RoE is basically the same show I've seen there since I started going to epcot as a kid in the 80's. I find it Disney's most unimpressive fireworks display. Don't get me started with the living with the land snoozer or the soon to be defunct Ellen's... Crush is fun for my kid, and I like to walk the aquarium areas on a hot day.
With all that said, we really love WS for the different tastes and interacting with the native folks that are employed in each country. It's usually the most relaxing day in regards to not having to do anything while we wait for our FP's, so we can sightsee and take in the fine details of the park.
Gone are the days of wonder and amazement that I had when went there as a kid. The interactive experiences I had when I was 6-8-10 years old are irreplaceable and left an impression on me for a lifetime. But that ship sailed long ago. Epcot will never be that again. The sad state of upkeep on rides and attractions that have made Epcot into a half day park 'appear' to be changing. Only time will tell though.