Do you work out at home or a commercial gym? Have you always trained with such abbreviated routines?
I train at home. Haven't belonged to a commercial gym since '94. I have a very adequate home gym. Mainly free weights with just a few basic machines like a lat pull, seated calf, leg curl/extension.
Nothing against commercial gyms though and I've casually thought about joining one for the social aspects. The whole chain gym thing kind of turns me off frankly. Getting on the credit card deduction thing doesn't appeal to me. In my town there are several chain gyms. I've only been in a Golds one time in the early 1980s when they were first franchising. There is a big one about 2 miles from me. Other chains and Crossfit gyms nearby too. Only one garage type gym but it is a sports training/personal training place the son of an acquaintance of mine owns so it would not be right for me.
As far as routines I've done them all. Full body, splits, HIT, etc. All depends on the goal.
I'm doing my current routine because I'm trying to regain strength. I'm getting older (60) and want to have more strength. Hopefully to retain as much strength as I can. So the best way to do that is low reps and long rest periods (4 minutes) between sets so you can lift heavier. Even though only a few exercises it takes me 1.5 to almost 2 hours.
For example on a squat day I do maybe 8 warmup sets and then 8 more work sets. So that takes well over an hour just for that. Then I do calves which is fast (3 sets) and maybe curls and some abs. So it takes almost 2 hours!
To get stronger requires a progressive system of training. There has to be a method by which you progressively increase the weight lifted. It doesn't have to be complicated but there has to be some methodology. Bodybuilding is different since it focuses on pumping the muscle with higher reps and using a variety of movements. Not as conducive to maximal strength gains.
The way I am training currently I have to forget about getting pumped and all that bodybuilding mentality. Bodybuilding is good. "Building the body".
Bodybuilding as it practiced is unhealthy.