Zenkit

When you paste several lines of text separated by a line break (when there's an enter space between lines of text) into a new item on List or Kanban view, Zenkit will ask you if you'd like to create one item or several.
To create several, just click on "Create X Items". Zenkit will create as many items as there are lines of text, and ignore any big blank spaces (where there are several enter spaces between lines of text).
To paste it in one item, just choose "Continue editing".

This trick can also be used to paste multiple lines in a checklist field!