I know from my personal experience (I am the US citizen) immigrating to Canada was very very easy. Granted, my husband remained in Canada and I returned to the US while we filed my packet. The longest part for us was gathering the important documents(all in all my fingerprints from the FBI took the longest to get). From the date that my husband sent in the first packet to the day I arrived in Canada as a permanent resident took a little under 3 months. To me, that was not to horrible, considering I was still able to come to Canada and visit my husband while my immigration packet was being processed. I would have to say the big difference in immigration processes would be:
1)Canada liked to see proof of our relationship (pictures, emails, phone bills, travel proof -- border stamps, airline ticket stubs, joint lease, cards to one/or both of us,etc) where US wanted just the basic forms (wedding certficate). Now I am not sure if that kind of proof is needed for K-1 because we filed IR-1.
2)While packet is pending, Canada let me enter with no hassles, whereas my husband could not enter while the immigration packet was in process.
3)For Canada immigration, we never had to have a single interview of any sort, for the US, we had 2 interviews.
4)My Canadian immigration packet weighed a fair amount ( i had 2 accordion folders filled with paperwork), US immigration packet fit into one folder, hehe.
If anyone has any questions, I will be more than happy to help where I can. Just a note , I did file OUT of Canada packet not INSIDE Canada packet. I do know from the board I was on at the time, things are a bit different depending on which route you do file for Canadian Immigration (ei time frames, proof of relation, etc.)
Now....for Vancouver! My husband was born and raised in British Columbia, so for him, it was like a child in a candy store when he took me back home! I absolutely loved B.C. I did a lot of first's while I was there. First airplane flight, first time to ride a skytrain,seabus,ferry,electric bus(although not toooo much different from a regular bus). We went in the beginning of April, and the weather was perfect. We were there for 3 weeks, and it only rained 2 days outta the whole stretch, got very lucky

My favorite time was going to the island. We took a drive up into the mountains, and boy was is it beautiful. I remember standing and just looking up and seeing snow on the trees at the very very top and the looking at the trees right in front of me with no snow. My husband took me to several different waterfalls, the hotsprings (I actually sat in a hotspring pool. Talk about relaxation at its finest!) We also went to the pacific ocean. All in all, I would have loved the chance to live there, but "other" things prevented our decision to move there. If anyone gets the chance to go and visit, I would highly suggest it. We only did about 1/3 of the things on my husbands list of places to go/and see. LOL.