Speaking of 4DX, I watched Godzilla 2 in 4DX last week and I honestly quite enjoyed it.
I went in expecting it to be just a distracting gimmick but I was pleasantly surprised to see it actually added to my experience. It's probably because the whole thing is completely in-sync with what is happening on screen (there was no interval either).
I would liken the experience to what controller vibration brings to games (just with a lot more intensity :P).
There were still a few distracting bits (the useless snow effect comes to mind) but I really don't think I would have enjoyed this movie had I not seen it in 4DX.
Now I wish I could've seen Pacific Rim in 4DX 😕