In "the old days", the only thing I ever had any reaction to was lith developer - minor dryness and itchiness. When that occurred (after multiple sessions) I started using gloves. At that time I didn't use a pre-wet and don't recall emulsion scratches. Nitrile, non-powdered, examination gloves are what you want. Available from any pharmacist, or online. By the time the sheet is in the fixer you can turn on the light and use self-grip tongs on the edge - no need for two gloves. Glove is for dev and water-stop, naked hand is for everything else.

Since I first started with them I have used gloves any time I have needed to stick fingers in developers etc. It seems only prudent to avoid dry or cracked skin.