I've got a few clumps of BES in my garden, and so far they only proliferate near the parent clump, so they're not too hard to deal with. I have given away quite a few, so I hope nobody is regretting planting them... mostly, the people I've given them to aren't much into gardening, so "tough" plants that spread a bit are ideal.
I've recently become a fan of Yellow Oxeye, Heliopsis helianthoides v. scabra. I grew it from seeds incorrectly labeled "Chocolate Daisy," so until it was ID'd I was calling it Not-Chocolate-Daisy. It blooms all summer long, a little more lemony than the golden color of BES but very similar. It does have a less tidy habit -- a little less mounding, a little taller and tending to flop around on occasion (I'm not big on stakes or cages) -- but it's perfect in my "cottage style" border. I get some volunteers from it each year, so I'd say it reseeds about like an Echinacea might, but so far it hasn't been thuggish. It's easy to winter sow... So you might give it a try! :-)