Yes, but you have to factor in how easy they are to exploit. The conjuration one I wouldn't call relevant, just lame, but the smithing one is kind of mind-numbing. Why do all smithed objections gain such significant chunks of experience in the field? Why isn't there a cap to how much I can improve by smithing the same item, or a cap on how high you can get on iron items? It's just a basic level of forethought we're asking for here.
Or just something as basic as harder pieces giving more skill XP? I see a negligible difference between making an Orcish armor (1 Iron Ingot, several Leather Strips, 4 of the rare orichalum (sp?) ingots) and iron daggers, they give me almost the exact same amount of XP. So when I craft said armor, what incencitive could I possibly have to craft another? To sell it you say? Well it's not like gold is hard to come by, plus unless you spend hours wandering the world looking for veins you will probably buy the rarer metals, so you don't make that much of a profit. Increasing Smithing by only crafting gear that you or your follower will wear will not get you far, you are basically forced to either endlessly grind, pay fortunes for training, or abuse the hell out of the system.
Many skills are like that (Alchemy, good lord alchemy, I need to make about 30 potions before I level up). Only my primary weapon skill (two-handed) evolves naturally; the others (Archery and Heavy Armor) I had to train to get up to scratch because they don't level up fast enough. Block? Forget it, the effect is negligible, and it's only at 30 and I use the feature during most fights. This game has a truckload of internal balance issues; yes, balance in a single-player game, it exists, because it provides incencitive to try out different builds. For a game that has such a high budget and puts so much details into it's world Skyrim makes many rookie mistakes.
Still, it remains fun. I am, however, starting to replay Dragon Age: Origins (a game I must have completed 4 times), and steadily it's getting more playtime than Skyrim, which I haven't finished yet. May tell you more about my preferences than Skyrim's own qualities, but still.