"I hope you enjoy yourself. Irrational fears can be so debilitating."
Its not an irrational fear. It is a fear and I dont' know why you would categorize it as irrational anymore than someone fearing a snake or deep water, etc.
The OP was the one that said it was an irrational fear.
I was just going to point this out.

I do consider it irrational, because my rational mind will tell me I'm not in danger, but I still can't control my fear. It controls me, & I hate it.
Funny that you mentioned snakes. That's my other fear. It's as bad as heights, even plastic snakes & snakes on TV creap me out. I have a good reason for that one though. My older sister took me to see the movie "Rattlers", when I was 8. What was she thinking?

I have no idea why I'm so afraid of heights though. Noone else in my family is.
To the OP, I too struggle with heights but I try very hard not to let it control me but I have limits. I have dined at CG and will be having my 25th anny with my wonderful DH there in Sept. You can get a table where you are not near the windows and still enjoy a lovely view and wonderful meal. You will be looking *out* over the view that way versus being right near the edge of the restaurant where you truly sense the height. In your case I would absolutely not go out for the fireworks. My intention is to ask if I may try to go out pre-fireworks and if I cannot handle it, we'll stay at our table. I'm not going to ruin it for myself by trying to push the issue.
I know I couldn't handle the observation deck. I can sometimes tolerate heights, after I get used to it, if I'm looking at the view from a distance. My body freezes & won't allow me to go near the window.
I've have so been there.

We had nose bleed seats for an NCAA tourney once. I tolerated it & even enjoyed it. It was the Tarheels afterall.

Needless to say, we only went to their games. There's no way I would have gone up there for any other teams. I have turned down free tickets to the Buccaneers, because they were high up.
I'm curious as to why you'd even consider dining at CG, if you have a severe fear of heights. Is there a particular dish you're really wanting to try? Are you part of a larger group that's dead set on going to CG?
It's a very good restaurant, to be sure, but there are something like a dozen restaurants of similar quality on site, and all of them are on the first or second floor. The main thing that distinguishes CG from the rest of the pack is the view, and if you won't be able to look out the window without being very uncomfortable.....
Honestly, I'd look elsewhere. If you're already feeling nervous about it, I can't imagine how you'll feel the day of the meal. With all the wonderful dining choices at WDW, why put yourself through that much misery on your vacation?
We have one ADR to fill on our upcoming trip. This would be before or after Spectro. I thought I had narrowed it down to Kona or Narcoossee's. My DS chose Narcoossee's, of the 2. Unfortunately, the pics I looked at here don't really appeal to me, so I was thinking of suggesting CG instead. Maybe, Narcoossee's food is better than it looks.
I explained why I was considering going there earlier. I've copied the quote above.
I don't usually get really nervous about heights, other than flying, until the fact. I'm always convinced I can do it this time. (I have a "won't give up" mentality.)

I'm just trying to be proactive this time. My poor hubby has had to carry me off steps or to the top to ride a water ride down quickly, whichever is closer. When I get to a certain height, my legs go weak, shake, & lock up. They literally won't move.

I've passed out on high platforms before, at least what I consider high, most people probably wouldn't.
If the CG is not at the start of your holiday, why not go over to Contemporary and explain your situation - that you have a reservation for a few days time and you are afraid the height will spoil your meal. Ask if you could go up and just have a look, if it's a no go you could try and change your ADR to somewhere else.
That's a good idea. If we go with CG, I'll probably send my DH up instead. He can usually judge what I can tolerate.
No way!!!

There's no way I could have walked all the way to the window. I've stayed on higher floors in hotels at the beach (not as high as 32), & couldn't even get close to the sliding door leading to the balcony. I can't look over a balcony on the 4th floor much less that high.
To the OP - I have eaten at CG on a few occasions and I have a fear of heights. I was fine, even on the observation deck. With that said, there are actually much better restaurants to eat at. You are allowed to go up to the lounge to have a drink though and this may be the best way to see how you would handle the height if you chose to eat there one day.
Where would you recommend in the MK area?