We noticed quite a difference our last October compared to the previous one. I think it was because Disney were doing one of their special offers to try and get the Americans to visit and so all the resorts were VERY busy, therefore so too were the parks.
We spent the first week (week and a half before our half term over here) in Orlando and this is when it was very busy, especially when we compared
MNSSHP to the previous trip (still excellent though). The first time we literally walked on ALL the rides, including Haunted Mansion, Peter Pan etc. The latter trip we had 15-20 min waits on most rides. The same was to be had in Universal, even with FOTL access for staying onsite we couldn't go round and round on MIB and Spiderman like we have previously. However, after our week in Orlando we moved down to the beach for another couple of weeks and a couple we got talking to there our second week had moved down from Orlando and said it was much quieter, so hopefully your two weeks you should just time it about right
Sadly October is becoming a very popular time to go over there for the Brits, especially when schools bring in the new term structure and have two weeks off in October. The prices for October have reflected how popular it is too - the costs have been creeping up - stil not as bad as the summer though
It's a great time of year to go. The weather is fantastic, the crowds will be fine.