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In EL you can use both the . or [] operators for method calls / properties, e.g.: #{foo.bar} #{foo["bar"]} are equivalent. The latter is not supported by the EL refactoring (find usages, rename) and in fact the EL parser also does not seem to support it for parametrized method calls (even though as per the spec it should). I'm not sure whether supporting it is worth the effort as using the . operator is much more common. If anyone strongly feels that [] should be supported, please raise your voice here.
Changing to an enhancement, I'm inclined to think this isn't worth implementing. Again, anyone who thinks this would be important, please add a comment here. I've yet to see an app that uses the [] operator for method calls.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss