Hi Chris,
Our business was also exploring the Gantt chart and I have an open ticket for a bug within the Gantt chart export.
I also wish there was an option to control your export with a "fit to page" options, so I can get exactly the view I want on one page, but that functionality does not exist as far as I know. Below is the workaround that I have been using, maybe it will help you:
Try setting up your view and filters to give you the right columns and objects that you want as part of the Gantt export (the less columns, the better). Then set your time increment on the Gantt chart (fit all, year, month, week, etc.) using the drop down on the upper left corner of the Gantt chart. Then use the slider bar (+/-) at the top to focus on the time period you want exported. Then export using the option to export "What I see." This should export the time period in your current view. I found this usually keeps it to one page. It's not perfect and leaves a lot to be desired, but it's workable.
The bug I have a ticket in for occurs if you try and use the secondary adjustment bar at the bottom of the chart to adjust your view to show exactly one year or a month, etc. If you try to export after adjusting the view with that option, at least in my experience, you will get a crazy random export of a few days or hours.
