Well, at least she won't storrow herself

Why respect non-existent rules that Adam makes up when existing ones like a 40mph speed limit (and lower in some short stretches with side streets) are regularly exceeded by about 10-12mph by automobilists? Why aren't they considered dangerous scofflaws, as they have destructive capacity orders of magnitude greater than cyclists and the legal obligation to follow traffic rules that actually exist?
Because the police won't take the risks (can't really blame them) to enforce the law here, so drivers don't give a flying eff about being stool samples.
Not that many cyclists do either, but they aren't a big threat. Try riding a bike into someone's house and setting the bike ablaze.

The first link you posted is of Do Not Enter signs at the outlet of the Charlesgate exit ramps. Yes, there's also a no ped/bike/horse sign below one of the Do Not Enter signs, but since one would only violate those signs by going the wrong way up a one-way exit ramp, traveling head-on towards vehicles exiting Storrow, it doesn't strike me as particularly objectionable or noteworthy. It seems sensible (and moot for this conversation, since - whatever her other flawed decisions - the cyclist wasn't going the wrong way on Storrow; she was traveling in the same direction as the cars with whom she was sharing the road).

The second link is surprising. It's presence would seem to be contrary to established law on the use of Storrow. Perhaps its addition was an uninformed oversight on the part of whomever (sensibly) posted the No Trucks sign below which the no ped/bike/horse is posted.

Honestly, it doesn't really matter much to the extreme pro-biking crowd. They'll just argue the law is stupid and unecessary and harms the ability of bikers to be "safe" by doing whatever they feel is "safe", or not slowing them down, or whatever goalpost-moving reply they can come up with this time.

I e-mailed these pictures to the Boston Transportation Department and am waiting for a reply. I said that my understanding is that Storrow Drive is legal for bicycles and I want to know if these signs represent a new local ordinance (and if we can expect more such signs) or if perhaps they are just meant to keep bikes off those particular ramps, and not Storrow Drive itself. I will share my findings as soon as they respond.

Don't equate full lane cyclists with those that swerve in and out. These are cyclists with two very different skill sets. The full lane cyclists are predictable--they go in a straight line, signal lane changes, make eye contact with drivers, and follow the traffic laws. They are visible from pretty far back and give car drivers plenty of time to decide what they want to do. It's the curb-huggers who pose the greatest risk for accidents because they're the ones most likely to swerve into the traffic lane. Their far-right position also invites unsafe passing by motorists who think they can "thread the needle." My problem with the woman in the picture isn't that she's on Storrow Drive; it's that she seems to be all the way at the right edge. On that road, you either hold the middle of the lane or forget it.

Waste time going slower than they might otherwise? Maintaining traffic flow is one thing, but allowing car drivers to go as fast as they want, unimpeded forever and ever, isn't high on anyone's priority list. We are delayed routinely by school buses, crossing pedestrians, construction and emergency vehicles, left-turning vehicles, parallel parkers, etc. The law informs you essentially to suck it up and proceed in a safe and responsible manner until you can pass safely and at a reasonable speed.