I might agree more if they didn't park in bike lanes so often; it forces a dangerous merge.That said, the small box truck or UPS truck blocking lanes doesn't bother me in the least. Isn't that exactly the type of heterogeneous use of our city streets that we want? Keeping the lanes clear at all costs is part of the auto-centric thought process we all despise.
(Hopefully this will be less of an issue once the protected network starts to build out.)