So, started a Journey Mode character and here is what works and what does not.
Infinite Health : Works as intended in all circumstances.
Infinite Mana : Works as intended in all circumstances. (Have gone through 22 different MP using weapons. Reasonable to assume it works for all.)
One Hit Kills : Seems to work and not work at random. Bosses aside, I see random minions survive magic missles when cast, and there is no discernable pattern.
Change Item To Selected Quantity : Works and doesn't work. Most items will work fine, but every so often one just refuses to update. The editor can fix this issue. However, using this option on any item in the Journey Research Box causes the game to crash.
Infinite Quickbar Items : Same as above. Randomly works and doesn't work. Almost always on the same items. One such example is the Tattered Cloth Goblin Scouts drop, if that helps.
Infinite Potion Duration : Works for various buffs. I haven't tested them all but seems to be in working order.
Reveal Map : Does not work in Journey Mode. Lighting is set properly, it just fails to reveal the map.
Toggle Ghost Mode : Haven't used this much. Others can explain it better if it works or fails in Journey mode.
Super Speed : Does not work as intended in Journey Mode. Just fails to trigger or says activated but does nothing. It's worked literally once out of 10ish attempts and I have yet to get it to work a second time.
Fast Time of Day : Haven't used this since Journey has a Sundial Command.
Maybe I'm doing it wrong but i couldn't get anything to work except items dups