I'd say that foreplay evolves. For us there is a lot less passionate groping and more purposeful moves that we know our partner likes. But to avoid boredom - we are careful not to do the same things each time. Toys are such a big help with this - by just choosing different toys the whole experience changes.
Having three kids and working makes it hard for us to both not be too tired to take our time with each other. There's still foreplay, it's just not as passionate as it used to be..but we're working on that!