I quite cheerfully hate both cat and dog poo.
The cats here poo in our flowerbeds (we have to get them grassed over this year it's that bad) and when they run out of room they dig up our driveway down to the hardcore to find soil to cover it with or just do it on the grass itself. They've also been known to do it on the back lawn and in the raised beds, so I have had to buy netting and go through all the rest of it to cover everything to make sure the cats don't leave poo about for either me (pregnant atm) or my young son to find. Oh, and the cats have also taken to pooing on my flat roof (there's a bit of moss to cushion their arses), which means I can't open that window when it's sunny either due to the stench. No repellent has worked thus far, though I am considering an actual lion... 
There are also at least two dog owners who need a lesson on how to use their hands to pick up their dog's poo. This makes me more cross, though affects me less overall. 
Honestly, I'm around £140 out of pocket so far for all the steps I have taken over the last couple of years, probably more. For other people's pets. And, at this rate, we will have to have the front driveway redone at least partially to make the hardcore deeper and less accessible to the little b*stards.
Oddly I like both cats and dogs (though am allergic to both). Just not their cr*p. 
Have always wondered if a raised bed area with a nice fluffy soil/sand mix surrounded by long grass and catnip in the owners gardens would help - if not for their own cats then on a "cat-swap" basis for others in the area.