Virgin are as good as any & better when you can access the frequent flyer discounts. Also to the best of my knowledge they are the omly company who has the Downtown booking in office on your leaving morning.
This allows to book in get rid of your luggage & get your boarding passes 1st thing in the morning, this gives you the best part of a full day left to enjoy Florida. All you keep is your hand luggage & when you get to the airport you only need to do security & you are off, very civilised.
As a side note frequent flyer discount applies to your whole holiday, tickets, excursions, hot air balloon flights & anything else you purcasd through them. They are also available in resort if you book anything extra with them & you often get meal vouchers of discount vouchers as sweeteners. They are also very easy to get hold of if you do have a problem & are genuinely available 24/7 in emergencies for peace of mind.
They are also Disneys prefered Uk TA so can often get rooms in places where other TA's encounter no availability.