Hey, Bonnie...
I've seen a few benchmarks where it took "slightly" longer than .06 of a second...but like you, I've never had any real performance problems with it.
Maybe we can judge whether it takes more than .06 of a second for someone to type...
oMyData["Invoice.....uhm, was it InvoiceNumber or InvoiceNo???]
as opposed to
oMyData.I [and then get intellisense]
;)
Kevin