Really? On Mac I've found it very consistent that alt+left/right jumps forward/back one word, alt+up/down jumps to start/end of paragraph, cmd+left/right jumps to end of line, cmd+up/down goes to beginning or end of all text (like Home/End). This is the case for me in Sublime, RubyMine, Xcode, Firefox, Chrome and any other app I've used in recent years - which apps are you using that don't follow these conventions?