Believe me the regular suite is more than big enough for 2. It's on 2 floors for a start and is as big sq ft wise as most flats or apartments.
We were on the 10th floor and the view was fabulous - if you tell them it's for your honeymoon you may get an upgrade anyway but if not then you will get other gifts.
For one night I wouldn't say it was worth the extra dollars because you get the same freebies - top dollar Hermes products etc. in each suite and the overall experience will still be the same.
I stayed there for one night in November and did a full report called Latti's in the Burj - I'll bump it up for you to have a look at