Hello,
Cabinet making is a broad church, so it really depends and what you are doing and your level of expectation. I have an 18 gauge nailer and use it for fixing the MDF backs to MDF carcasses. (and plywood too). It is good for this task, because MDF is poor to fix with screws or regular nails. The flat profile of T nails doesn't split the MDF when I nail the back into the rebate. It also has an ancillary benefit, not often known, but the thermoplastic glue which hold the nails in a strip, actually melts with friction as the nail is driven, then solidifies and acts as a glue. The nails are essentially glued in! It is amazing how strong the backs in the cabinets are, done like this. I also make painted furniture, so nails are useful and will never show under paint. I even nail shelves into their housings from the outside face of painted furniture of furniture than will be placed in an alcove, where the sides never show. With the shelves glued, clamping is eliminated with nails. What I never do is nail through the shelf into the housing, a la Norm, and never in fine wooden furniture, where glued joinery is invisible and does not want filler anywhere! It is horses for courses, but I do find them handy in the right instance.
Mike.