Recommend a commercial EnergyPlus GUI?

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I work for an energy consulting firm and we are using OpenStudio to model everything from multifamily to office high rise buildings. If you already know how to use EnergyPlus, even at a basic level, OS can drastically reduce modeling time. I think it is inaccurate to state that "it is apparent that it will never meet the needs of our consulting firm where speed and accuracy are essential" when talking about OS. The development is happening at a very rapid rate and it is getting better all of the time. My company does a high volume of energy modeling and on very short timelines and we have been successful with OS.

If you do want to use OS using the script functionality is extremely import in producing models quickly and accurately. If you do not wish to learn how to write basic ruby code then OS is not for you. If you are willing to learn, then scripts are by far the most powerful tool and are what makes OS a viable commercial modeling software.

I am also curious to hear others opinions. Openstudio in my most basic understanding has a lot of potential when the user understands how to write measures to optimize workflows.

In terms of other EnergyPlus interfaces other professionals are using, I am curious to see which is most popular in a setting where speed and accuracy of simulating large commercial buildings come into play.

We use EnergyPlus in its raw idf / text editor form in commercial practice. Over the years we have developed spreadsheet inputs which help take a lot of the mundane data entry work away from us and it speeds us up no end. We use sketchup/open studio legacy to build the geometric model after that we don't really see the need for a GUI interface, being engineers we love excel and use that to sort our data inputs and then originally we put everything in manually but now as I said we automate it using super simple excel coding (looking to improve on this next year). The only difficulty is understanding EnergyPlus logic, but once you have that figured that out it really doesn't seem to matter to me whether you have a GUI or not.

Oh we do heavily rely on the ESO viewer to help us analyse and trouble shoot our model we would actually be completely lost without that.

DesignBuilder is very visual and easy to use, you can run the complete simulation without export the file to EnergyPlus, with detailed HVAC system you can have a template for the 8 systems - baseline Appendix "G",the HVAC and building 3D models are simulated simultaneously to ensure the dynamic interaction between the building and systems is treated accurately.
Comprehensive Ground Source Heat Pump, Underfloor air distribution, Dedicated outside air systems, and other systems have been added recently to version 4.

OpenStudio has commercial users also, but it's not for everyone and not really intended to be. You could look at DesignBuilder, AECOSim EnergySimulator or Simergy. Maybe others on the site who have experiences with one or more of these can list pros and cons.