p but maybe you're looking for something like wrap in parens? vimsexp (and vimsexp for humans) give a lot of paren manipulation objects and movements.

Sometimes I go to end of the form, insert a new line, adjust the indent to my preferred level, exit insert mode, and the paste with [p. Now that I type it out, sounds so convoluted lol but I haven't got my indent settings quite how I like them otherwise, and I have the muscle memory for this one.

@UPWHQK562 that’s just what I mean. I have tpope’s vim-sexp bindings installed.

(yank this form)

(paste
  end
  of
  this)

I could also move to the last line of target form, paste linewise, slurp, and reformat

that’s not too bad I guess.

Also not great that if pasting into a one line form, yaf doesn’t paste with spaces around it (which would be analogous to yaw in vanilla vim)