Eh. The Talmudic exegesis is primarily legal, and as such doesn't show up much in Genesis. The systems of when to employ allegory are mainly analyzed by the Medieval and rennaisance scholars, such as Ibn Ezra, Maimonides, Nahmanides, Gersonides, and Luzzatto, with Gersonides and Nahmanides forming the liberal and conservative ends of the (rationalist) spectrum respectively.
On creation though, ex nihilo is most definitely the dominant account, and even the Kabbalists go along with it; the ideas you're referring to (presumably 'Ein Sof') are more panentheist ex nihilo than anything else.