Stupid. Just, no. If traffic engineers really respected bikes and cyclists as actual traffic, they would set up signal detectors to work for cyclists, instead of putting a BS button over at the side. If I'm going straight or turning left, and the pole on the corner with the button is 25-30 feet away, no way am I going to risk trying to move laterally in front of other vehicles trying to turn right, just so I can hit a button, then try to get back over to where I was. Or worse, try to cross at or near the actual crosswalk only to have to re-negotiate my way back into the traffic lane on the other side, or do the same thing over again to make a "box" left turn.
But no, obviously they don't care about cyclists and instead just take this ridiculous shortcut way out, and expect that to be sufficient.
The whole thing is idiotic.
The only place where I have used such a device while on my bike is where a bike path (MUP) crosses a few busy roads, one of them being off-limits to cyclists according to the signage. That's the only place IMHO where these are justified.