When I was on my 6 just a couple weeks ago, I definitely felt the pain of 1 GB RAM. One use case in particular pushed me into upgrading to a phone with more RAM: my bank's mobile app had a check deposit feature that consistently crashed upon taking and processing a photo of the check. The first thing I did with a new SE was download the same app and try the same workflow... worked smooth as butter.
Besides that, the 6 still edited photos and handled every other basic task like a champ including scanning images to PDF. It had issues reloading tabs in Safari- but so does my MBA from time to time!