In 5E, in actual play, have you used any of these at all during the time that they have been published options? I will be posting several polls separately to get a feel for what people are actually doing.
Spare the dying is great for a grave cleric since (iirc) it's ranged & doesn't count against cantrips. For anyone else it's a waste of a cantrip s;pt that could be replaced with a trivial cost trivial weight healers kit.
Traps are nice in theory, but 5e's 6-8 medium to hard combat encounter gas tank & extreme lack of risk that the PCs are built around just makes them overkill. I remember me & my players using them & similar pretty often in the 3.x & earlier days but using them siccessfully on 1-2 of 3-5ish encounters could be a big deal since & any given encounter could really matter. In 5e I've regularly seen players who wanted to use them on every encounter after setting them up & expecting an MMO style "pull" of monsters to their obvious trap simply because it's in the middle... but it doesn't matter now.