The TNG "Timescape" episode where Picard starts laughing, and then we see that he made a smiley face in the small puff of smoke coming out of the beginning of the warp core breach.

Denise Crosby waving goodbye to the fans.

Not to pause it, but definitely a back-up-and-replay moment: when Data tells Tasha he is "fully functional"

Terry Farrell always made the screen shine with her presence.

You’ve missed out pretty much every scene with seven of nine in it!

I'm sure that the 'corridor with mirrors' room was meant to just be a regular exercise room, but you're right that it was very obviously just a section of corridor in which the set crew stuck big mirrors on either end.

I flew to Germany with data, Deanna Troi and Geordi La Forge.

I actually really enjoyed the scene with Crusher and Troi, but not for the silly costumes or the aerobics. It was simply a nice moment between two female friends talking about a guy. Something that really isn't reflected often in media in a good well done manner. Its a nice bit of banter between female friends without making it vindictive, oversexualized, sarcastic, or snarky. I found their outfits silly and fun but far from sexualized and the aerobics were really not anything close to fan-service.

There was a very well executed scene in Star trek Enterprise where T'pal is shown as one of her ancestors topless behind a white sheet gently blowing in the wind with an extreme close up of her in a well thought out and carefully shot silhouette of possibly Joline Blalock's actual body for a few seconds... pause worthy.

Fun fact re: #1:

Oh my god the best advert interruption ever. You said Dax Looks a bit..... then the ad for Pringles starts and what are the first words? On screen? Sizzling Hot. Yup that perfectly describes what Dax looks like

Yes. Yes to all of these. Though "All of Enterprise's decontamination scenes" should have been higher in the rankings in my slightly pervy opinion..

Kenobi on the Millenium Falcon:

Pretty much every scene that T’Pol was in was worth pausing in my book