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This is true, it's not the biggest impact we've seen in F1 either. Two that come to mind are Alonso at Interlagos in 2003 and Kubica in Canada 2007, both absolutely huge shunts. But whichever way you look at it, Grosjean went from 137mph to zero rather abruptly. And unlike the other two he didn't really have time to come to terms with the impact, shake himself off and then try to get out. It's not the survival of the impact that amazed me (although still incredible), it was his ability to get out of that fireball in 28 seconds or so after an impact of that magnitude.
How the heck did he remain conscious after a 53G impact?!