mm.... i suppose death is the return to the natural conscious plane rather than the human plane.
So true, no matter how much money you accumulate, houses you own, or businesses under your control, eventually you shall join the millions of others in the ground or burned into a ceramic vase.
Dust to dust....... the ultimate return to your beginning foundation. There is no proof of another plane of existence other than to condition everyone that there might by a 'possibility' of existing somewhere else (all religions count on that same premise).
There is no "proof" of anything, only evidence convincing enough to meet your personal criteria for "proof". For some people there is enough evidence to meet their criteria for "proof" of an existence beyond the physical. For others, there isn't enough evidence to convince them that even the physical is "real".
For me, I am convinced of the existence of something beyond our current physical experience, based on the evidence I have seen / experienced personally.
And for me, life is far from boring. I have a sense of purpose and a whole lot of things to get done before I die. Like making keyboards, trying vintage Blacks, owning a buckling spring board, etc...