There are plenty of good features that are worth upgrading for in 5.14, but this is not one of them.
Even when writing code that requires Perl 5.14, I avoid this new feature, preferring to use an explicit @{} dereference operation.
As chromatic has pointed out before, when combined with the fact that Perl 5.12 allows each, keys and values to work on arrays like they do on hashes, this feature introduces ambiguities. (What happens in blessed arrayrefs which overload hashrefification? Or blessed hashrefs which overload arrayfication? Or blessed scalar refs which overload both?!)
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
