Thing about weaponplay is, the more training and technique is involved in handling the weapon is inversely proportionate to how actually effective it is. The reason you are having to do so much training with the weapon is because it's ineffective and you need to make up for the weapon's lacking points with skill.
Throughout all the weapons in history, there are only 4 for which this level of extreme training is justified. Fists, swords, bow, and sling. Fists because you always have them on you, swords because you can put them in a scabbard and wear it on your hip and almost always have it with you, bow because range, and sling because also range and also increased portability.
Any other weapon, if you can't figure out how to use it to good effect within 2 hours of picking it up, you should discard it.
Spear passes this test with flying colors. It only takes a couple hours of spear training to start using the spear effectively. Same goes for mace and bo staff, as well as most any pole weapon.
All that said, all of these highly effective simple weapons have one massive detriment. You can't easily mount them on your person, so you wind up having to hand-carry them. That's a big part of why the 4 weapons that require a lot of training are still very worth while, just about every one of them has a means by which you can easily carry it on your person. (Although, in the case of the bow, it's stretching it a little.)
EDIT: On another note, a dagger actually manages to find itself in a very interesting place. It's easy to use AND highly portable. But, of course, it's also very short, so it's good to also have training in a different weapon.
On the battle field, it's always been the case that you use a primary weapon from the selection of the easy use variety (spear, mace, ect...), you have your sword as a back-up weapon in case you loose your primary weapon, and then you use a dagger to finish off armored opponents that you have knocked down or potentially to use as a weapon of last resort if you even loose your sword as well.