I was a Picasa user for several years and I really liked it, but after Google Photos was announced and I saw the handwriting on the wall and completely switched (with much consternation) to Google Photos and have had a great experience. I uploaded over 17,000 to the Google-free tier and applaud all the automation they have built around auto-panorama-stitching, auto-animations, auto-face-tagging, auto-object, and auto-location. I've found that I share my photos much more now, and I also really enjoy having a single stream for my DLSR and smartphone photos (my workflow is to backup uncompressed DSLR photos then upload to Google.)<p>Picasa served me well, but I've moved on as well.