I say yes, and it would be a more definite yes if you're staying onsite and taking advantage of early entry.
We rode Gringott's about 15 minutes after the start of early entry and it was essentially walk-on. The line was backed up to near the beginning but it moved at a steady, slow walking pace and we were on in less than 7 minutes I'd say.
Same circumstance at Forbidden Journey, although there was no EE. The line got held up around the greenhouse area but still moved at a slow steady pace. On in less than 10 minutes, and that was because of a technical difficulty.