Nowadays I try to avoid using them when I think the panel can go without them, I think they should add to the page rather than be there just...to be there.
I also think there can be such a thing as too many of these. Say there's a character who plops themself down in a cushy chair while laughing and wiping away a tear from their face, while in the background another character is scratching the back of his neck while observing - Do you really need "shwumf" (the chair noise), "scratch scratch", "ahahaha" and "wipe" all in there at once? XD In that situation I would go for what would be the loudest, in that case, the chair noise and the laughing, and even the chair noise might not be absolutely necessary.
...and even when I do use them I try avoid trying to use too many 'blunt' sound effects unless I feel it's really needed for some reason (IE "Sit", "stand", "glare", ect.) For example, I would be more likely to use something like "wssh" instead of "throw" when someone's throwing something.