the LH SEN status may be a very good one for you to pursue as you definitely put the miles in. They generally treat SENs well.
Lounge access through Star Alliance system for you and wife.

LH does not have E+ like UA...but you could possibly get exit rows, etc.
They occasionally provide op-ups for their frequent flyers. (and you get an upgrade certificate or two for reaching SEN status).

Caution: All LH fares do not earn 100% miles! Beware when you purchase tickets.