Oceania still does the mid cruise survey(hand written) and the final survey. Yes, it is online but on our ship the CD kept announcing you could get help to complete it online.
Yes, the ship crew reads the surveys. I know because we had 2 examples of the crew responding to our comments. Plus, the final survey is advertised as having the chance to win $100 SBC if the comments were submitted by a certain date. Well, lo and behold, at breakfast my name was announced! I went to reception and was advised that it was not transferable to my next cruise. I only had $8.75 on my bill. Once we were at home, I contacted our TA who communicated with Oceania and a week or two later we had our credit on our next cruise!