I honestly do not care about instant preview... On one side I prefer to focus on my writing in text, witch means my LaTeX sources are well formatted for human readability and well spread as needed for the same reason when (rarely for me) I write not so short stuff, I have my collection of templates for almost anything and anything I need something different I collect the LaTeX structure a bit, even if trivial, in an org-mode note, to have ready made stuff as needed.
On the "final" step looking for produced pdf issues I have to recompile sometimes, mostly on tables/TiKz stuff, but the little build time does not disturb me... The only a bit annoying part is the "like-a-lisp" default interaction mode in case of error finding it essentially useless since I have to correct the sources anyway.