Overated? We never had to amass our full strength. Barca is still growing, Terran has a strong military, and D'Hara should be able to double their military force. Madina and a possible new Caerwynian republic can't counter our strength.
Honestly, we'll never know that until someone challenges you. If you're good, you'll be able to amass some serious strength. But since you've never had to do it, then when the times comes to do it, I imagine it will take quite some time to shake off the rust.
One good thing you have in your area is the lack of serious monster attacks. That's one of the things that keeps us busy in the north. (And keeps PeL and Morek busy, too!) Perhaps one day, when you have expanded to fill all those rogue regions around you, you'll have to challenge the Zuma for more land. That's what I'm hoping to see.
A Viensormoot/Zuma war.
Woohoo!