Yes, as long as you follow them that's great. What I do object is that emphasis on phonics and reading at a too early age. True, it doesn't hurt them to sit and listen to the phonics songs at pre-school, but most won't gain anything either. Wouldn't it be more sensible to stick to rhymes and songs with actions, they may include games with turn taking, dancing etc. - luckily the headmistress of our Infant School forbids phonics teaching at the nearby pre-school - for many, especially boys, starting in R aged 4 is too early.
'Start them young, so they learn more' is a rather uninformed statement in my opinion. Young children learn best by doing things they have chosen and are interested in. I can't imagine sitting my 3.7 year old down at a given time to do age appropriate things. She sits down and draws (more than 1/2 hour this morning), we read and she concentrates for ages (unfortunately, at the moment she likes her brother's Dirty Berty stories and copies stuff). She writes when she wants scribby letters - this morning she wrote 4s, lots of them, and then turned them into socks, she wrote As and then turns them into rockets that fly to the moon, a medieaval rocket, a Victorian rocket and one for the Ancient Egytians so that they can all fly to the moon.
I think she is learning lots of stuff and I am in no hurry to introduce phonics, unless she really wants to read. That said, yesterday her brother read a book to her and she said. Oh, you can read well! I can read too! ... wouldn't need phonics though as I speak German to her and reading in German is a lot easier to learn.