As a Seagrove local who occasionally drives a car on 30a (but tries to bike or ride a scooter instead whenever possible), I can imagine how it can be frustrating to share the road with road cyclists when you're not a cyclist yourself. If you're in a hurry, any traffic hangup can be frustrating, and I agree sometimes you will have to slow down and wait to pass a cyclist, which sets you back a minute or so.
This isn't a new problem for cyclists: empathy from car drivers is a constant challenge for those who are out on the road for exercise, or who choose not to drive a car wherever they happen to be headed (and good for them!). 30A is a scenic highway, ideal for cycling, and while its speed, crosswalks, and diverse traffic (bikes, runners, skateboards, golf carts, scooters) are unfortunately viewed as an inconvenience to some, there is thankfully an alternative for faster driving: highway 98. If I'm heading somewhere in a car on 30A and must be there at a specific time, I just leave a little early to account for the unexpected, and so I don't need to drive fast.
The flip side to this discussion is that many locals here would prefer to see far fewer wide SUVs and trucks crowding the roads and parking areas - especially in high season, or as we call it, "SUV season." We should be celebrating the fact that our community is so active and that many are willing to occasionally ditch the car for other means, rather than trying to restrict those activities in favor of a faster road. It's a rare thing that we have here on 30a, and it only takes an increased speed limit, widened roads, a few traffic lights and a chain restaurant or two to make it a different place entirely... more like everywhere else in the state, frankly.
We cyclists are fortunate and appreciative to be able to share the road with you, but there are definitely good reasons to choose the road over the excellent path depending on the type of riding you're doing. We'll continue to stick to the right lane and all we ask is you have a little patience for us. Thanks!