Originally Posted by
JALPak
Um...did you mean the JAL First Lounge or the Sakura Lounge? Is the F lounge as crowded too? JGC Premier should let you get into the F lounge
Sorry, my profile was out of date...

It's been a while since I was JGC Premier. (I just updated my profile today.) But since you ask, the F lounge (when I could still use it) was also quite crowded, though not as bad as the Sakura Lounge.
I should add, however, that the one time I used the new Sakura Lounge in the satellite of Terminal 2, it was much less crowded and much quieter than the main lounge. But no massages or hot food there (at least when I used it last year).