We were at WDW 5/9-5/15 and only saw a handful of lovebugs. Living in Florida, we're used to them and get rather amused by the frequent comments here. They don't bite and we don't pay any attention to them, but some people are just creeped out by any bug.
Lovebugs can be a real problem when driving for long distances on the expressways, though. They'll absolutlely coat your windshield and definitely obscure your vision.
If you are driving the Florida Turnpike, there is a windshield washing station at each rest area. (It will be right where you say, "Why are all those morons just sitting in line for nothing?" just before you re-enter the Turnpike.) You just pull up to the station and the water jets come on automatically. Does a pretty good job.