I don't know, I sometimes used "Raising <t>" without a sound effect but I noticed sometimes I'd start hardcasting Raise, pop the macro immediately but around 5-6 seconds in my co-healer will swift Raise and waste it. I don't think everyone reads chat during a hectic fight and the sound effect can probably get momentary attention.
The only Raise macros that really bother me are the directly rude ones. There are worse things out there than a bad joke or a single <se.6>