I fall in the same boat of not enough "Wooing"
Some girls are high maintenance, some arn't. But its pretty easy to let a girl know she is being though of, and thats what most of them want. Bringing her flowers for no apparent reason (because you were thinking of her) is a great way. Weekend trips can help too. Woo != $, and if it does, then you need to find another girl.
She wants to feel special. She wants to feel like you constantly think of her.
If she is more laid back, she could be woo'd by a six pack of beer, a large pizza, and the NBA finals to watch. But not likely....