Hey Michelle - the benefit of a cot is that once they are in, they can't get out without someone taking them out.
Where kids in beds, well pretty much just climb out and go walk abouts.
So the 'crazy' part is probably related to this concept.
If you feel you wish to place your daughter in a bed, for what ever your reasons are, the do it, she may need one of those bed railings until she is about 3 years old.
I also found placing a pillow on the side of the bed away from the wall forces the mattress up, and my experience tells me that kids seldom roll up hill in her/his sleep - so that works really well if you are putting child in a bed without a railing.
Kids do sometimes react to changing from a cot to bed, and sleeping routines may shift, and because kids can get out of bed themselves, you might find said child standing next to your bed at 2am asking for water, or better yet whilem you and DH are doing the funky monkey suddenly you hear a little voice going 'what you doing?'
Other than that, nothing too major.
I will confess to having a strict 'you do not get out of bed unless I come get you' rule which stood me in good stead, and allowed me a few more minutes sleep in the morning and also prevented kids getting out in the middle of the night and wandering around.
Also you need to be a bit more security conscious as now child can walk around the house, when you might be sleeping.
I personally hang on to the cot as long as humanly feasible until I move them to a bed, but my reasons are: so I can sleep a bit later, so I can have a stronger control over nap and sleep time, so I can think my child is a baby for just a bit longer.
So none of the rules really are about the child.
Hope that helps.
<possibly other Moomies have other opinions>