I did. It's a good pavilion, but not on par with my favorites content wise.

One more pavilion I would like to mention is Malaysia. It has a reasonable line length, has a good exhibition and also has a great show kitchen and reasonably priced food in the pavilion's restaurant (there is a separate line for the restaurant).

Good to know their food quality at the Expo is good. Their regular location in the city (at Namba Parks) was very disappointing to me taste wise, so I didn't even try getting into the expo location. I did ask them about reservations on site and got told reservations for the day get full at 9:20am already. With sufficient advance planning, I think you can get reservations using their smartphone app (though it will not accept a reservation for one, the minimum is two people). Their Android app is only available if your phone location is set to Japan, you have to sideload the APK from a third party website to get it working (it is also in Japanese only).

I see suggestions to walk on top of the the ring after dark. This is a very tricky proposition. Walking the ring is a great experience, I did it myself. It's also great to watch the sunset (in the direction of Kobe) from atop the ring.

However, after dark is also a great time to visit popular pavilions because the lines get much shorter than during the day. You have keep this in mind. One evening I was walking on top of the ring with another flyertalker I met at the Expo, after having watched the drone show. She noticed that the line to the France pavilions got so short that you could practically walk in without waiting. But there was no way to get off the ring quickly, so by the time we made it to the pavilion, the entrance was closed already.

Before 10:30am and after 7pm are the most valuable times at the Expo thanks to short lines. So if you only have a single day at the Expo, I believe it's a better idea to walk atop the ring between 5:30pm and 6:30pm (with the heat being bearable already), but then to get down and try getting into popular pavilions with relatively little waiting time.

The same applies to the drone show in the evening. It's an ordinary drone show, nothing special. Sitting in front of the water with lots of other people watching the show does have its magic, but comes at the expense of visiting interesting pavilion with little waiting time.

Oh, one way to visit lots of interesting pavilions while skipping lines is to accompany someone with a wheelchair - the wheelchair user and the person accompanying them get to skip the line at many pavilions. If you know a wheelchair user in the Osaka area, maybe worth asking if you can invite them to an exciting day at the Expo