Congratulations!!! So, it looks like you'll be getting married mid to late October. This is usually a pretty slow(?!) time of year at WDW!!
IMHO, slow or not, I WOULD advise anybody to make their ADR's, at the very least!! I don't think that would be construed as 'over-planning'. Ever since Disney came out with the Dining Plan, it has been harder and harder to just 'walk-in' most restaurants! Dining is a BIG think at WDW!! You don't have to 'micro-manage' your Honeymoon, just (A) - figure out which places you want to eat (B) - decide on a 'loose schedule' and (C) - based on their locations, figure out which meals best fit with your schedule. The way I do it looks something like:
Tues - MK (am), Epcot (PM)
Crystal Palace (B) @ 8:30 am, MK (9:30am - 12:30pm)
Resort afternoon break (1:30pm - 4:30pm)
Epcot - (5:00pm - 9:30pm) - Le Cellier (D) @ 7:00pm
I think you would find that a 'loose sched.' will allow total flexability and peace of mind for you just by knowing WHERE you will eat each night.
Hope you have a fabulous holiday!
for our disneymoon Oct 2-8 and they were BOOKED for most of our trip.... we really had to compromise our schedule to get to the restaurants we wanted (especially the castle for dinner). I was told that it's because of the Not So Scary Halloween Party going on during October. So, if anyone is going in October and you have restaurants that you really want to go to... book now! In most cases, the worst that will happen is.....nothing! 
We are going the last week in October, and I was able to get all of our ADR's. October can be a tricky month. Last year, we were there during Columbus Day week. The parks were very busy. Remember, some of the schools have a fall break. I posted a message about fall break for this year, and I received a lot of replies that the fall breaks are around the end of September to the middle of October. Hopefully we'll avoid any crowds during the last week in October. 
