Samesies. I really hope this becomes an optional setting because I really like communicating with my AI in full sentences and paragraphs, and often with code blocks. To me these AI convos are not chat.
It is possible to change your chat prefs to reverse the default cmd-enter behavior. By default in chat when you press enter you submit the chat message, and when you hold cmd when pressing enter you get line breaks. But then you are slowing yourself down when you are chatting with someone!