Oh are you a Mac user? I often forget that Enter and Return are different. I meant "manual line break, however it is that you produce it with your keyboard or mouse or whatever." In general I always advise against the use of the manual line break to control the rag or composition of a paragraph. I've spent a considerable chunk of time removing them in order to produce a document that will e.g. easily make the transition to HTML or ePub or content-management system or translation memory database or whatever. The point is that a manual line break is for me a less repurpose-able, more "final" method of affecting wrap than is something that prevents a linebreak, like a nonbreaking space. These considerations may not apply in your case, but I'm sure that they apply at least some to the sixty-odd people who have already read this thread, which is why I'm soapboxing about it.
Control is only being taken away from you if you are unaware of your options - I switch from the Paragraph Composer to the Single-Line Composer sometimes, myself. I have a set of scripts to which I've assigned keyboard shortcuts so I can switch composers on the fly, which I do all the time (mostly from Adobe Paragraph Composer to World-Ready Paragraph Composer). I turn off auto-correct on almost every single application I use, usually because it hampers me instead of helping. But this is a case where, if you care about good paragraph composition (and you obviously do!) you should consider it.