Break out the different statuses into tabs
I like the idea of the New, Replied, Waiting for reply, In Progress, and On Hold. I like that I can hide them too, but I would like for a quick way to see the statuses that are hid. I was thinking maybe tabs across the top, with the headings of the statuses and a number indicating the number of tickets on each tab. Perhaps, and default view displaying what you have now, and then a tab for New, On Hold, In Progress...and so on, each with a number beside them showing the number of tickets. Or...maybe just a little pane showing each status with a ticket count. I would leave Resolved out of both solutions.