Hmm, some very interesting views. I suppose memorizing an essay isn't all that bad, as long as your essay is like a broad type (don't remember it word by word, otherwise you might be screwed).
You can do an essay in either way:
1. memorise the issues, contexts, evidence to support that (techniques) through quotes,etc.
2. Memorise a pre-written essay, but this essay should attempt to cover most of the areas of your text. This way, for people who are fast writers but slow thinkers, you can do all the thinking before hand, try experimenting that with past questions, and apply it under exam conditions, this way you can see how much you can write through the memorised essay you have.
Overall, memorisation isn't bad, you just need to know how to alter it to suit your needs in the hsc. But if you are able to learn the text through its issues,etc it would probably allow you to cover a wider perspective of the hsc english.