As the mom of two - I will try to calm all of your fears!!
I was so sure I could never love #2 like I love #1 - I was worried that he would take away my attention from her - that she would feel neglected - that I could not give him the attention I had given her etc. etc. etc.
He is just another member of her large fan club - he ADORES her and she ADORES him -
it is true that you can not give two what you would give to one - but I feel that in exchange - they give each other so much more than I could give them
I am married to an only child and I know he is glad we have two - he thinks he really missed out on sibling interaction
Sure - I can't really take both of them to the store at 2 and 4 but then again I can't take the 2 year old at all!!!

I think 3 years is a great age difference b/c you will get some alone time with #2 while #1 is at school -
the biggest thing you will learn is that after having a 2 year old - babies are EASY!!! You will have time to work up to having two running around your house - in the beginning all they do is eat and sleep - although this seemed overwhelming with #1 - you will laugh at how hard you thought #1 was when you have #2
Oh - and I do love #2 the same as I love #1?
ABSOLUTELY NOT!! I love him for totally different reasons in a totally different way - but just as much!!! They have such different personalities and I get so many different things from each of them - I didn't fully understand this before he was born - but I do now!!
I KNOW you will not regret having #2!! #2 will be just as scary as having #1 - it's just a whole new set of concerns!! Weren't you a little worried when you had #1? and you wouldn't trade them for the world!!