I have or have had in the past cards in nearly every sort of holder that's been available. I haven't creased any from cardsavers, but can see it happening.
I generally go with a variety depending on the card and condition.
worn cards - nothing unless they're odd sized or old.
Nice commons - penny sleeves, with toploader if they're older or really nice.
Stars- penny sleeve and toploader unless the card is a total mess like many of the 50's topps I have.
I used to put some of the really nice T and E cards in mylar inside a toploader. Pretty sure I creased one, and since then I've cut the toploader out from around the mylar sleeve.
I've seen plenty of cards with that telltale crease at the top center from less than careful removal from a sheet, and a few with lower right corner bends from slumped sheets.
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