Some Are
Whether or not it will be of use to you to load +P or +P+ in a pistol (that can safely handle it, of course), depends on whether or not the extra pressure will translate into extra velocity. Velocity is the point in creating the extra chamber pressure in the first place so, without it, it is a pointless exercise in wear acceleration. And yes, there have been some +P loads made that produce no appreciable increase in velocity, other than the speed with which they move off the dealer's shelves.
All +P ammo should come in under SAAMI pressure specs for it. +P+ gets out of spec entirely, but not necessarily to dangerous levels. SAAMI pressure specs for 9mm is 35,000 psi for standard pressure, and 38,500 psi (or +10%) for +P. So, if a load goes to 38,501 psi it becomes +P+. Is that dangerously over the level? It might be for an older, non +P rated gun that you are already pushing to it's limits with +P ammo. A modern +P rated service pistol probably won't notice the difference. This goes for compact versions of service pistols, too (Glock G26, S&W M&P9c, etc.), which is nice, because, with their shorter barrel, they can use the extra help in keeping speed up.
In revolvers, .38 Special is the one cartridge that routinely gets loaded to +P levels, and the only one I'm aware of to be factory loaded to +P and +P+. Many modern revolvers are labeled ".38 Special +P." For them, there is no doubt. For older guns marked only ".38 Special," it is important to find out from a trustworthy source, ideally the manufacturer, whether or not your gun can handle +Ps. The older the revolver is, the dicier the prospect, especially if it is a 5-shot snubbie with thin little chamber walls. +P+ should never be used in a .38 Special, as it was designed for use in .357 Magnums.
But wait! There's more!
My two pet carry loads in 9mm are Winchester's RA9TA 127gr +P+, and Federal's 9BPLE 115gr. +P+. Winchester claims 42,000 CUP for their load. While there is really no conversion table for CUP to psi, from what I can discern 42,000 is right in the range where the two scales agree to an extent. This means that the Winchester load is probably somewhere around 40,000 psi. That is hot 9mm. The Federal load has reported to be designed to produce only the very top of SAAMI's 38,500 psi limit. The reason, they label it +P+, so the story goes, is to take into account any variances in manufacturing that produce individual cartridges that might be ever-so-slightly over-pressure.
These two loads really capitalize on the higher pressures, and have earned an excellent reputation for effectiveness in actual use. There are others. I won't try to make a list of them, because I would surely leave some deserving ones out, and that would offend someone, and that would, I predict, divert this thread from discussion on pressure to a discussion on bullet weight (which it very well may devolve into anyway).
Now, how much will you pay?
In the end, you don't need +P or +P+. There are good standard pressure loads. If your gun is not cool with +P and up, you can do fine with one of them. If it can handle it, though, you don't necessarily have to pay through the nose for +P or +P+. I personally have been buying the Federal 9BPLE lately, as overruns and surplussed lots have been periodically hitting the market (they only produce it for LE agency sales). It's still going for less than $20 per box of 50. I also just purchased a couple of boxes of Federal's .38 Special 158gr. LSWCHP +P for about the same price. And there are others in various flavors to suit your tastes. While I truly believe in paying more for more when my life is on the line, when the opportunity arises to the good stuff and save money...well, I may be stupid, but I'm not that kind of stupid!