As most everyone knows, I prefer 1/2A although I do have a few .35-.40 size models. Their size is more manageable for me--less wood, less glue, less covering, less paint...engines are much cheaper, and you have to really work at it to burn up a single gallon of fuel in a season; less space required, both for building and storing...no mufflers req'd, nor wrist thongs, etc.; fly 'em on fishing line, on most any ball diamond, park or parking lot. Bump up to the .061 size and you have the best of both worlds, 1/2A size planes/equipment that perform like the bigger models.
Re: the "rock on a string": When I was a kid my father used to tell us, "When I was your age (had to be 1920s) we didn't have all the toys you have; all I had to play with was a stick and a piece of string." "How could you have any fun with that?" "I'd tie the stick to the piece of string and swing it around my head."
Here I am all grown up in the 21st century still doing pretty much the same thing!
--Ray