I am not a fan of the shotgun approach either.The most effective way to eliminate internal parasites is to have a manure sample tested by a lab or a vet or anyone who knows what to look for with a microscope. Once you know what parasites you are dealing with, if any, you can do targeted worming with the appropriate wormer. That way, you aren't treating unnecessarily, underdosing or overdosing.
It is not hard to get where you can "float" them yourself.
At the end of the day, that would be a lot of trouble for most.
I will not pay a vet to do anything with my birds.