Do you think it is best to try to get as many TS meals as possible? I am worried about having to wait in horribly loooooooooong lines during FD. Any input from others who have attended during FD?
not really sure what you mean by long lines? At TS? at CS? Lines at TS's don't really mean anything because I'm assuming you have your ADRs in place. There are lines at the CS places because everyone on the DDP gets one per day and those who didn't know about free dining or didn't want it are trying to eat at the CS's because the TS's are full!!! So, yes, there are lines at CS's. Try not to hit these places at peak meal times.
If you are talking about reservations for TS meals...you should definitely make them as soon as you can if you will be there during free dining. If it's free dining, you may not care about having credits left over, but if you want TS meals you must reserve them.
You can't make reservations for CS but the best advice to avoid lines is to avoid eating at peak mealtimes.