Can't say I've ever heard it called boxing here in the states but timber formwork is still very much alive and used. The forms are removed after the concrete has set so wood rot isn't a concern. Nearly all residential concrete is done this way unless there's a cost advantage in reusing forms for multiple pours. Wood forms are frequently discarded after removal but in some cases a builder may be able to reuse some planking.
Here in New England concrete forming contractors carry reusable form sections from job to job. At my house I made a staircase form out of plywood and scrap, but that's your Home Depot level project. ..
Every Italian guy doing concrete I've ever known and there's been lots since they were family or friend's of family, reuses his forms. You can see them on the truck going from job to job and then they scrape them off with their trowels into the pour area prior to reuse.
