bigskip on every new paragraph with latex

I'd give

addtolengthparskip{bigskipamount}

a try.

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The following compilable example shows (a) that both parskip and bigskipamount are rubber lengths by default and (b) that adding two rubber lengths produces, sure enough, another rubber length.

documentclass{article}
usepackage{lipsum} % filler text
begin{document}
thebigskipamount % show value of bigskipamount

theparskip % show value of parskip
hrule
lipsum[1][1-4] par lipsum[1][5-9] % output two short paragraphs

addtolengthparskip{bigskipamount}
theparskip % show value of parskip again
hrule
lipsum[1][1-4] par lipsum[1][5-9] % output two short paragraphs
end{document}