Yes, I've known CRT to accommodate people who just wanted a peek - I was dining in there once and a newlywed couple came up, and it was the best thing I had seen all day. The bride's eyes just popped open and she yelped out, "WOW!!! Ohmygod this is SO beautiful!" That really made me laugh, so I actually went up to them and started talking to them, to congratulate them, etc. They told me that they couldn't get a PS, so the CMs just let them in the castle to take a look. I was actually VERY surprised that the CMs didn't let them in to dine, since I've heard so much about the perks that newlywed couples get (complete with bride/groom ears and all), and since it didn't seem busy at all. I suppose that could get out of hand with potentially a floodgate of non-PSers showing up, insisting newlywed privileges. Still, I was surprised at the time.
I'm not a castle person, but my friend is, so every time we go, it's a "must" to dine in the castle. Still, I think it is rather pretty inside, and it's worth a look. It's beginning to grow on me, but it takes my friend's breath away every time. She LOVES it!