We are staying in a good neighbor hotel,
It doesn't matter what hotel you are staying at. MB+ at
Disneyland don't do anything special at Disney owned hotels.
MB+ allow you to tap into the turnstile in each park. Many people screenshot an image of their ticket for easy access. IMO, you are waiting in line to get through the turnstile so it is just as easy to pull up your ticket on your phone as it is to use a MB.
MB+ allow you to tap onto your LL rides. This is very convenient.
MB+ allow a PhotoPass photographer to quickly tap your MB and load pictures to your account. The tap/scan happens after your photo is taken. If you put your phone down for the photo, you'll have to pick it up, turn it on and find the PhotoPass code (different from your ticket) to load your photos. In this case, MB is very convenient.
MB+ light up and glow during entertainment (ex. WOC, Fantasmic) and on certain attractions. Personally, I find this distracting. I'm watching the show, not my MB. I usually wear long sleeves during the evening entertainment, so just feel the buzzing on my wrist. I think the idea is that, if everyone is wearing MB, it will look similar to the light up bracelets that they give you at concerts and will add to the show. In reality, it doesn't.
MB+ allow interactions with some statues in the parks and DTD. You swing your arm in a circle and (sometimes) you will hear sound coming from the statue. I say "sometimes" because, often it doesn't work or it is difficult to find just the right place to get the sensor to pick up your MB.
MB+ can be used for Bounty Hunters. This is something to do if you have a lot of extra time.
Note: MB+ at Disneyland do not sense attraction photos. You will need to enter the photo code into your app. Most people take a picture of the attraction photo and enter the code later in the day.