Well, you can claim that Perl 6 is going whole hogger on context sensitivity than Perl 5, but the fact is that Perl 6 is cleaning up all those silly post-declarational switches you're carping about, and forcing them to be predeclarations (except for /x, which is going away entirely because it's mandatory). Left-to-right parsing is darn near mandatory in Perl 6. Lookahead dependencies are generally limited to one token. About the only exception I can think of offhand is deciding whether curlies are composing a hash or declaring a closure, and this is handled by thinking of both of them as closures, but then forcing an evaluation-time call on the closure if semantic analysis determines it's a hash composer.

As for /e, that's also gone in favor of generalized expression interpolation.

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