I think it would be a great addition to Smart Lists to have auto coloring when certain steps are AND vs OR.
For example: Marketo would visually decipher between AND and OR in the following: 1 and 2 and (3 or 4). Therefore steps 1 and 2 could be colored green and steps 3 and 4 could be colored blue.
This would allow for the ability to visually determine when an order is correctly aligned.