First, some general thoughts on TDR.
After coming on the heels of visiting SDL, TDR was actually relaxing. Something you won't often hear people say about the place. The constant crowding that you hear is largely true (but just like MK or DLR, of late, also exaggerated).
In five days there (three full at DL, two full at TDS) we never waited much longer than 20 minutes for anything. We never saw a wait in either park exceed 90 minutes (generally that was TSMM, which we didn't ride, and Indy at TDS and Splash Mountain at TDL). I say that because those waits are less than what people generally put themselves through at WDW all the time.
FP works there. And they wisely use it as needed. For example, it has been shut off for both Mansion and Star Tours because there is no need for it at all now. It is the polar opposite of SDL and the direction that WDW (pay to play) is headed. I don't like FP largely, but this old school system always worked best at DL and WDW and certainly does here. SDL is another matter ...
Also, you may hear that weather is terrible in summer and you shouldn't visit. I believe Disney Blogger to the Stars Tom Bricker has said as much. But we did TDR like he did a few years ago, catching Tanabata Days and the start of the summer fest, and did just fine. If you would do August in Orlando, then July in Tokyo won't kill you. It's actually better because they don't do our crazy time changes, so it gets dark at 7 and with the breeze off Tokyo Bay is amazingly pleasant at night.
As to the parks in general, they are incredibly beautiful and maintained. They are staffed to levels that would make Georgie K (as he shifts labor costs to DAK and closes MK 3-4 hours earlier than typical recent summers) crap his pants. No, the park isn't spotless, but it is as close to perfection as really is possible. And WDW used to be like this ... maybe not in over two decades, but it was.
Show quality is unsurpassed. In five days, I struggled to find a minor effect not working anywhere. I didn't find any. On attractions where at WDW (or even DL) you have static figures (think the RR scenes), TDR has animatronics. They may be limited, but they move and are all working. You don't need bloggingwhores making excuses for why major show effects aren't working like WDW does. The OLC has across the board standards that scream "WDW in 1983" ... AAs are silent. WDW Guests today probably have no idea that is the way they are supposed to be. Small attractions or less popular ones, things like Tom Sawyer Island or most of Toontown, look brand new and all that needs to be maintained is. Hanging out for an hour one hot afternoon on TSI reminded me of my first visit to the island with my family as a kid (yeah, I am not 71, sorry!) in 1976 because it was so lovingly cared for.
Entertainment is simply of the highest caliber. Sure, Festival of Fantasy is a nice parade at the MK. But it is laughable compared to Happiness is Here. Whine and cry and long for the 1972 MSEP to return again to the MK, while TDL's Dreamlights is an absolute tour de force of what a night parade in a Disney park should be (and, yes, it shames PtN as well ... but at least that parade can be spoken of in the same conversation). I saw Fantasmic for the first time there. It is different than stateside shows, but works. I still prefer DL's, although I haven't seen the new show yet. But it makes WDW's commercial for 90s WDFA laughable in every way as well. From live music to streetmosphere, TDR has it.
How about that Once Upon a Time show that MK took and bastardized? The original is absolutely beautiful. An ode to Walt era animation. Huge segments from Pan and Alice disappeared from MK's version to stuff in two Frozen musical numbers that don't fit. Since the show is ending, if you won't be visiting before November, YouTube it and see for yourself which show is better.
Sure, TDR doesn't do pyro like the American parks. Out of four nights they were offered, the pyro was canceled three. They do a short, but nice show that can be seen from BOTH parks. No need to camp in front of the castle for hours. Of course, tourists now expect Disney to do pyro every night in O-Town, missing the fact that until 1996 and WDW's 25th anniversary, the MK roughly did pyro shows only half the year.
Just some tidbits to start ...