If you go by Disney's 1970s concept, E tickets were:
Pirates of the Caribbean
Jungle Cruise
Country Bear Jamboree
Haunted Mansion
Hall of Presidents
It's a Small World
20,000 Leagues Under the Sea
Space Mountain
So in the early days there were 8 e ticket attractions. The fact that only one of these top attractions of the 70s is still considered an e ticket attraction, while 7 of 8 are still in MK, says more about our expectations for what is an "e ticket" than what it actually was when the phrase had meaning.
Personally I think if the E ticket system were still in effect, anything with a FP would be a C,D, or E. Given the E ticket designation was done by popularity and wait times, there is no doubt in my mind that if "e ticket" meant the same today as it meant in the 1970s the following would likely be e ticket rides:
Space Mountain
7 Dwarfs
Peter Pan
Thunder Mountain
Splash Mountain
Pirates *** could move down
Jungle Cruise *** could move down
D tickets would probably include:
Buzz *** could move up
Winnie the Pooh
Little Mermaid
Haunted Mansion
Mad Tea Party
Dumbo
Barnstormer
C Tickets might be:
Monster's Inc
PhilharMagic
Magic Carpets
Speedway *** probably would move up
All Character Meet and Greets *** some of these could arguably be in E or D just by wait times
The thing is, we don't think of E tickets in the historical sense anymore, we think of them as thrill rides. And that just isn't correct.