You were already scanning your KTTW to get into your resort so this wouldn't be different, I actually found it faster to tap my MB than to insert the card and pull it back out - sometimes more than once.
Regarding the parks, will likely make it more inconvenient by taking an extra few seconds to scan them for each car x all in line. But from Disney's perspective (1) the paper passes were too easily manufactured, altered or copied which costs them money at parks (2) Disney guests do have the option of Disney transportation, putting more resort guests on the buses means more cars they can get into the parks now that the attendance is obvious increasing. We have left the MK to see cars parked all over the grass. (3) Tracking mechanism in many ways but one is to know numbers of how many guests (your MB will let them know how many people are in your room) are driving to parks rather than taking transportation from specific resorts.
Last month I opted for direct to room check-in. I did not get a parking pass. Half the cars around mine did not have one. I think once they announced the direct to room that it was obvious the paper passes were going away. They really are of no value to resorts with parking lot gates. I've noticed them going away at lots of resorts, not just Disney.