Actually, being active and healthy were my motivations as well -- blood pressure, cholesterol and sciatica issues are what drove me to get serious. I think the thing that was most disconcerting about putting some of the weight back on (and having to take it back off) was that it resulted from my becoming lazy and slipping back into all the unhealthy habits that I thought I had broken myself from after 19 months of concerted effort. More dismaying was how easy it was for me to fall back into those bad habits.
Anyway, that's probably more than you needed to know about me. I'll just end by rephrasing my original comment -- I sincerely hope you're able to avoid the trap of falling back into old habits and maintaining all the new, healthy ones you've developed. :-)