I so agree with above poster. CGK is my home airport. I so HATE T3. Much prefer T2, and was dreading the day QR moved. Why do I hate T3?
1. HOT! Feels like a sauna.
2. At this point, there is one premium lounge for most non Garuda. It gets VERY crowded.
3. Airport built on the cheap. Looks 10 years old already.
4. Takes so much longer to move around. In T2, I could be from landing to taxi in 15 minutes. Depending on the gate I get at T3, it can take 20 minutes just to walk to immigration.
5. Getting a taxi or car at T3 is a mess. I usually resorted to just taking the train to T2 and getting one there.

Will miss the premium check in at t2 for QR and CX. So convenient for private checkin, private immigration, and right into the lounge!