One of the things I would miss here on Mastodon was all of the alerts from my local infrastructure and government twitter accounts. These will likely take a very long time to make the migration.
With https://bird.makeup, you can create bot accounts that put those tweets in your Mastodon timeline. For instance, I follow the Washington State Patrol account for regional weather related road closures and accident reports:
@RaymondBarbour @awilbert It is getting busier that's for sure! Right now it takes a few hours to cycle through accounts, but I have lots of ideas to improve this.