Nitpick: it's not an express lane, it's the entire roadway for this section. Non-HOV drivers have to either pay or take a completely different route. HOV drivers still get to use it for free, of course.
Exactly, which in turn burdens all the other roadways such as 29 and 50.
They were already burdened by non-HOV traffic. They might get it a little more during the expanded hours, but those could have been changed regardless. For most people, this is adding an option, not subtracting one. I don't get the outrage.