Actually, regarding the scaffolding of an app, it's exactly the same. Take a look at the Advent Calendar app, it's Dancer2! Nothing new here, 100% the same as Dancer 1 except that you can use any config file format instead of being forced to YAML.
The only change you have to do is about TT's defaut markers (they are [% and %] in D2) and also, the config hierarchy for engines which is now:
engines:
$type:
$name:
...
Whereas with D1 there was no "$type" level.
Appart from that, everything works just like the same.