Axel, I use 6th very rarely. It's too long a gear, so it would only be used on the motorway to put the rpm at a very low rate. As I positively avoid motorways in the Morgan, I don't get to use 6th at all. 3rd and 4th is where the action is for me.
I use 6th all the time, but don't use 1st

I do agree about 3rd & 4th

Ian