Yeah, the "new photo experience" used to be pretty easy to opt out of. Sometime in the last day or so they made it the default option. If there's a way to see it the way it was before, I don't see it. There are some things I either haven't figured out how to do yet or you just can't. It's easy enough to get the code for linking to photos on Amin's forums, but it takes an extra couple of clicks to do it and Flickr doesn't remember the last size used - it always seems to default to a long edge of 500 pixels. And I can't for the life of me find the link I've always used to link to DPR forums. For that you used to select the size you wanted to view and then just copy the image URL and paste it into DPR, which would then give you the option to embed the image there. Now you can't select the size to view the image or to copy the URL and paste it into DPR. With Ipernity, you can select the different sizes to view and you can copy the URL, but DPR doesn't seem to recognize the code from Ipernity...
Bottom line, the advantages that Flickr had over Ipernity up until yesterday it doesn't have anymore. Both are fine for linking photos to Amin's various forums, but neither, AFAICT, can link directly to DPR any longer.
Bummer all around...
Fortunately I opened an ipernity account and transferred all of my photos over to it while it was still easy to do, a few days ago... So at least I can choose from two highly imperfect options!
Edit - found a way to get the right code for DPR from Flickr - it requires copying just a portion of the code found under the "thumb-tack" link option and pasting it into DPR. I'd guess you can do the same with Ipernity, but the codes are different enough that I haven't tried to work out what you'd need to copy...
-Ray