A really simple one, when you drawing a line and you want to start a new line, just push L to start a new line. This would be similar to illustrators' pen, with that if you have an active pen line and you push p again it commits the vectors already drawn and starts again. instead of having to press enter or click the checkmark just push the L short cut key to commit the already drawn line and start a new line.
Sometimes it's the little things.