If you are specifically talking about cleaning and such, I don't think there is much of a difference between 1 and 2 IF they are bonded and in the same cage. I still clean the litter the same and there is only one cage so the cleaning is the same. My two are dwarfs so neither eat alot so I didn't even notice a change in more food that much.
As far as being less destructive, there is no guarantee there and experiences are simply going to be individual. There are theories that a bonded rabbit is less bored and less bored=less destructive. But also, bonded rabbits teach each other things.....so that can be bad habits too
But again, just like chewing and destruction varies from rabbit to rabbit, it will from pair to pair as well.
I will say though that the previous posters experience that their rabbit "no longer liked them as much" once the new rabbit came along is unique and not the norm. It is even documented in popular rabbit bonding articles that the addition of another rabbit will not change your current rabbits feelings towards their human slave as rabbits have a different relationship with humans than they do with fellow bunnies. And that has most definitely been the experience for me. My female, and first bun, changed in no way at all towards me
I thunk the biggest challenge to going from one to two is the bonding. It took 30 days to bond mine and it was a time consuming, daily and tedious ordeal. I personally enjoyed then experience but it was alot of work. And when you first bring bunny home you need to of course house them separately and do alot of bunny dates on neutral territory so it's a bit of a process.
But once my two were bonded, it has been a breeze and I thoroughly enjoy having two
mine aren't too bad destructive wise. My female and first bun is not a chewer or destructive at all and she has remained that way. Archie on the other hand, is a bit of a chewer but for the most part is still pretty good.
Here is my favorite article on bonding. This woman believes you can bond any two rabbits. I think bunny dates are a definite need. If they don't all out brawl during that first meeting I think the chances of them bonding is very high. Now, how long it will take who knows, could be days, could be months. But this article covers most scenarios that can happen. I reference it alot as it helped me quite a bit.
Good luck!
http://www.rabbitnetwork.org/articles/bond.shtml
Oh and I wanted to say that i was VERY nervous about getting a second rabbit too
I was even having doubts as I drove home from just adopting him! Haha. But I had done my research and was prepared for the work involved and I am SO glad that i did. It has been so fun having two.