Why is it a problem?
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Not really a problem, i would say rather challenge, than problem. Because it is going to be a small pcb, but many many copper trails 
Another solution is: using SMDs, but also "Drilling-Holes" which connects to the other side
Okay, I'm gonna by SMDs.
Won't be very small when you use 1206 components! Drilling holes should be done using carbide drill bits made for drilling fiberglass.
No need to drill holes, that is what vias are for
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Seems the OP is somehow making the circuit board himself. So no ability to plate vias.
I did not pick up on that and a home made 2 layer PCB, whilst possible, is not easy to do
I can remember when light tables were all the rage for multi-layer circuit boards. Then they were just junk to people!
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It's usually a "feature" - it means that the other side of the board can be used to route other signals, whereas a TH resistor occupies BOTH sides of the board.
Not having TH components is a pain in the neck if you're using home-etched boards without plated through holes, and have a signal density that makes it important to use signals on both sides. You have to notice which components can be soldered on both sides, and be prepared to add extra vias.
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