You offer "just do it" as a panacea - it admits of no other options. That implies it must always work. That's what makes it woo-woo like homeopathy.
Someone who needs to get out of bed and struggles with it, is not helped by someone saying "just get out of bed". That's not 'advice', It admits no reasons for being unable to get out of bed, when there clearly are reasons - otherwise the person would already be getting out of bed. It doesn't care about the person or the causes of their problems, or ways of working around them. It only serves to be dismissive and make the person saying it feel better. That's what makes it smug.
Phantasmagoric visions of smugness, homeopathy and, now, panacea notwithstanding - what this "someone who needs to get out of bed and struggles with it" can do (unless they are somatically inept) is just move their limbs and get out of the bed after the alarm goes off (one of the simplest physical acts there is) ... and, hey presto, problem solved! No "ways of working around" are required in the first place; furthermore, such "ways of working around" is an insult to human intelligence (when a simpler alternative, that always demonstrably works, exists it would be foolishness of the highest order to go around in circles based on vainglorious but spurious rationale).
Someone who needs to get out of bed and struggles with it, is not helped by someone saying "just get out of bed". That's not 'advice', It admits no reasons for being unable to get out of bed, when there clearly are reasons - otherwise the person would already be getting out of bed. It doesn't care about the person or the causes of their problems, or ways of working around them. It only serves to be dismissive and make the person saying it feel better. That's what makes it smug.