(Warning up front, that I may mix up an occasional alternate world story in with the time travel as they don't always stay distinct in the memory.)
I also like Bick's "Time Out." I haven't read the Haldeman (in the Pile) but I think his story "Anniversary Project" is really good. If we're including his Forever War, then I'd add Anderson's Tau Zero and Sheffield's Between the Strokes of Night as great dilation tales. Also like Victoria's Heinleins, Rodders' Cowl, Randy's "Vintage Season" and alexvss' Silverberg. There were several excellent Silverberg time travel stories but I can't fix which is which in my head. "Hawksbill Station" in its novella format is quite good, though I don't think I'd be interested in the novel expansion. For instance, Varley's "Air Raid" is good, but I hated its expansion (Millennium).
I've either missed a couple of famous examples or they haven't been mentioned: Fritz Leiber's Changewar stories and novel and de Camp's Lest Darkness Fall. On almost any topic, I'll mention Asimov, with his End of Eternity (not my favorite of his novels, but still pretty good), the early "Red Queen's Race," the spoof article "The Endochronic Properties of Resublimated Thiotimoline," and probably more I'm inexplicably forgetting. I think Bob Shaw's "Light of Other Days" also qualifies.
Perhaps not as well known, Kuttner's The Time Axis, The Mask of Circe, and "The Fairy Chessmen" all have time travel included or featured and are all excellent. I think Williamson's "The Legion of Time" was pretty good, if not as good as his much more famous and larger Legion of Space series. Mildred Clingerman's "Letters from Laura" is sneaky, clever, and good.
It might not be any good, but I remember really liking Hogan's The Proteus Operation (one of many WWII time travel/alternate history books) when I read it a zillion years ago.
The ones that first popped into my head, though, were Charles Harness' wonderful The Paradox Men (aka Flight into Yesterday) and Lester del Rey's "And It Comes Out Here." There have been a lot of time travel stories written when someone like me, who doesn't even like them as a rule, has so many that he likes but the del Rey is a great one for people who don't like time travel. Finally, one that didn't occur to me right away but should have is Ted Chiang's "The Merchant and the Alchemist's Gate."