If it doesn't float easily, I'll quit trying and get back to it later. I've got other more important stuff to do than position a monitor I don't really need, so no rush. Sometimes TEE helps to float it.
If I'm taking off a unit or two of ANH blood, sometimes I'll just connect it sterilely and float it later, because the PA catheter really slows the bloodletting through the introducer.
Our surgeons want them for postop management. Whether or not it's useful to them or the intensivists isn't really something I'm emotionally invested in. It's a fast easy thing to do and we get paid more for it. I'm happy to put them in. There are other hills I'd choose to die on first, if I was in a dying mood.