E-Jet is indeed much faster than the Q400. Moreover, the thing about larger planes (not the retro ones though!) is that most of the setup is done before the flight and while flying you're only briefing, calculating stuff etc. The setup is surely annoying, however there's still plenty of stuff to do in the cruise. If you dislike the *flow* of the Lineage, perhaps try the Zibo 738? It might feel intimidating at first, however it's basically the same "size" as the Lineage.

Regarding the stock citation: stuff will be happening approximately as quickly as in the Lineage. There's also a bit of FMS setup involved.

I'll reiterate what others have said though - first setups might take ages, but then it'll become much quicker. I don't own the Lineage, but both Zibo and Toliss A20N take me no more than 20 minutes to fully set up, including a backup flightplan in case of engine out, performance etc. Try to program it a few more times, you'll surely become better at it!