Are horse drawn carriages cruel?

Good evening! So tonight i have decided to bring up a topic about horses that pull carriages for weddings/city tours etc
My big question is, is this animal cruelty?
I was in york over the weekend and i went on one for a city tour and the whole time i had mixed feelings, i felt sorry for the horse pulling the carriage but at the same time my thoughts were:
They're getting excersize, plenty of fresh air, being groomed, being fed and being looked after. But is that really the case? after all these thoughts i had to look into it properly.

I read an article about it once i had gotten back home, here is the link: http://www.peta.org/issues/animals-in-entertainment/horse-drawn-carriages.aspx

So the article points out how bad it is, but surely there's another side to this argument?

http://www.facebook.com/pages/Carriage-and-Working-Horses-The-Facts-Truth/264550006933684#!/pages/Carriage-and-Working-Horses-The-Facts-Truth/264550006933684?sk=info
Here is another side to the argument, it is a page set up on facebook and it is the truth and knowledge page on working horses.

Which team to you side with?
Do you think working horses/horse drawn carriages is a form of animal cuelty? yay or neigh?