That's ok, none of us played with 14 armor Wave Serpents/Warwalkers either. I assume you are referring to 3rd edition as 2nd and 1st edition vehicle rules were very different than today's. If you want to go back to a time when Warwalkers were absurdly scary, 1st edition is the only time I ever worried.
As far as Wave Serpents and Holofields; it would be nice, but we didn't get it in the new codex. They are still a pretty decent transport, even though a bit expensive. I like having a transport that is still a nice threat long after disembarking it's cargo. 7, S6 Shots is decent enough that your opponent can't ignore it even with it not being a scoring unit.