There's usually a decent amount of traffic on I-4 between Orlando and Tampa,being so close to Christmas I would try to leave early to avoid the traffic getting worse.I've done the trip dozens if not hundreds of times and most trips were with normal to heavy traffic and took about 70-80 minutes.Two times there was an accident and it did delay us by like 30+ minutes,luckily one of those times I wasn't driving as I took the Busch Gardens free shuttle from Orlando.We did their new Christmas Town even this past year and it was pretty amazing,Disney does a good job with their Christmas events but I always seem to end up more impressed by the events at Sea World and the one time I did the Busch Gardens one,just seems like they have more decorations throughout the park.