When a new user first edits a page, a popup offers the option of switching to wikitext or keeping with VE. If the user selects VE, there is no obvious way to get back the popup and no indication of how to switch to wikitext otherwise. If the user selects wikitext, there is a guider pointing out the back to VE button. If the user uses that button, the button taking them in the opposite direction is not highlighted.
The VE -> wikitext switch should have an identical guider (with user confirmation needed to prevent it from appearing in the future) to the wikitext -> VE switch.