Yes, I saw MacroPod's sticky thread shortly after I submitted my question. Very useful!
In my case I don't want to remove the blank lines, but, rather, make them about 1/2line, so that I can save paper when printing when the docs have lots of blank lines, but still see the intended breaks. So what worked for me was to search for ^p^p as you say, and then replace with Format->Font->Size 5pt. (My doc was 10pt text) The blank lines then appeared about 1/2 as tall. Thanks, Charles.