Hi Joe -
I just wanted to chime in because I glanced at that thread (which I've never stumbled across myself), and wanted to say that even IF some of the rides mentioned aren't a cool as others in WDW - there are literally thousands of rides/experiences/tours/restaurants/shops to patron while in WDW and, frankly, you probably won't get to do everything you want to do in 4.5 days, much less 2.
In other words, stick to your original day plans (although I find as an adult with no kids slowing down and enjoying the entire experience over a bunch of rides is a nice perk) and trust that there will be more available to you that you can possibility accomplish (a good thing), and that you'll likely reach the end of your vacation thinking about how next time you'll need more days.
Since you and your GF are older with no kids, here are some adult only suggestions that may help put things in perspective:
1) Walk around the World Showcase and sample all the different beers, or all the different desserts.
2) Watch all the movies offered at the various world showcase countries, especially the ones AFTER the rides.
3) Ride the monorail from the transportation and ticket center to EPCOT AND BACK, just because you can and because you get a great bird's eye view of EPCOT that way.
4) Ride Expedition Everest 4 times in a row using the single rider line. You and your GF will get to be together all the way up until the actual ride, and then it doesn't really matter.
5) Ride the MK train all the way around the park.
6) Treat your GF to a Grand Floridian SPA while you hang out at their beach or listen to the piano player in the lounge.
7) Get a Victoria and Albert's ressie.
8) Sleep in and stay out till 2 AM
9) Check out the Boardwalk at night.
10) Take your time through the two forest trails at AK.
Some total plus's (in my opinion) of NOT having kids:
1) You don't have to stand in those God awful long lines just to get character signatures.
2) You can skip fantasyland completely if you want and not really miss much.
3) You can quickly weave through crowds and strollers cause you won't have some kid's hand to hold.
4) No tantrums.
5) No diapers.
6) No bathroom breaks every 10 minutes.
7) All your shopping can be spent on YOU.
8) Pretty much all the carnival type rides can be bypassed (tomorrowland speedway, astro orbiter, Dumbo, heck even Nemo, etc...) they're fun, but trust me there are plenty of WAY COOLER rides in WDW.
9) You're not responsible for someone else.
10) You can change your plans whenever you want, you can do whatever you want, you can go where ever you want.
DISCLAIMER BECAUSE I DON'T WANT TO START ANY FIGHTS:
1) I am not against kids. I plan to have one someday.
2) I realize some adults might really like Dumbo, or the speedway, and that's totally cool.
3) I realize not all kids wear diapers.
4) I have nothing against characters.
5) I realize adults can throw tantrums too.
6) I realize that my suggestions aren't strictly *adult ONLY* except for maybe the alcohol part.
7) I realize that kids aren't just total tantrum throwing, potty going, stroller needing, character obsessed monsters - I'm sure its a whole different, albeit still equally enjoyable experience going to WDW with kids and I'm am totally down with that.
But this is the adults/singles forum, right?...
Ok, I have written WAY too long of a reply. Have fun Joe and GF!