Is having twins really that different?

This is a question I have been asking myself for awhile now.  Is having twins really that different?  I have only ever had twins.  I don't know what it is like to have one baby.  For the most part, my thinking is if you can do it with one you can do it with two.  I try my hardest to stick to this.  We still go places.  We go on play dates.  We go to the grocery store.  We run errands.  We got to story time at the library.  We do activities at home.  I really try to make sure I don't stop doing things because it is too hard, because that just means it is too hard for me.  They still deserve those experiences that I think are important for having a well rounded children.

On the other hands there are things that I just can't do.  We have a pool they can swim in... they have been in it 4 times all summer.  I just can't take them by myself.  I don't even feel bad about this one because safety is the main issue.  Right now we don't go to the park that much because with them walking but not really being aware of their surroundings it is really hard.  Ben usually sticks close by, but Penny is everywhere.  But there are definitely times they both want to go completely separate ways to explore.  This is really hard for me.  Now I can say this is a safety issue as well, and to some extent it is, but mainly it is a sanity issue.  I just can't handle it at this phase in their development.  I also think before I do anything "How is this going to effect the schedule?"  We are very scheduled people and it's hard for everyone to waiver from that schedule.

I guess I will never have the answer to this questions, but I always wonder... Is having twins really that different?

What do you think?