Yes I use them but with plants I grow hydroponically which I don't want drying out ever.

You can use them on your soil grown plants but you'll need to lift them out after watering and dump the water out.

I water by placing my plants on an old grill grate set over a bucket, then set them on trays to catch only the last little bit so my plants never sit in water.

Jojo

I have to use them on some plants, but they are likely to be anything I can find, the lid to a margarine tub, peanut butter jar, tin try from frozen biscuits, whatever fits under each pot. Don't think the holes in the bottom of most pots allow for air flow anyway. As long as there isn't water sitting in a try, that's all you can do.

One good thing about a drip tray is you can set a pot on the edge of it, to tilt the pot. If I have room after a good soaking, I like to do that, in case it wasn't really finished dripping, or so the tilt can allow more water to escape than sitting flat.

I've never found this to be a problem. I use solid plastic lids from plastic pints of ice cream. Not transparent, some I use as pebble trays w/ stones or pebbles, some I keep dry. I think this is of no concern at all.