Our first cruise was on the Wonder with a land/sea package in November 2000. My husband had sailed on tall ships (as a re-enacter) but I had never been out to sea. I was terrified I would get sea sick. Took my Bonine and had a BLAST. As soon as we walked off the ship, we booked a 7-day on the Magic for 2002 and have done a total of 8 Disney cruises over the past decade, with a diversion in 2008 to do NCL in Hawaii (to renew our wedding vows).
Our only non-Disney experience was the NCL Pride of America and I cannot say anything good about them except for the port stops and tour excursions were great. Otherwise, after that one experience, we would never cruise NCL again.
We have another DCL on the Dream in May and another on the Fantasy next year (which will make us platinum).
We feel like Disney is home because it was our first and we always feel comfortable there. However, we are willing to try other lines as there are many ports we want to see that Disney doesn't do (yet), and many cruise packages that are cheaper than Disney's. Next year we are booked on a Holland America cruise and land tour in Alaska and am looking forward to venturing out on our second non-
Disney cruise (and sure hope it's a better experience than our first non-Disney cruise
).
But all in all, we totally trust Disney for service, care, attention to detail and customer service, and will always consider it our first choice if itinerary and pricing are what we want.